🔬 Onahole Review - Raku: Error_69: System Override

Slibowitz · June 19, 2026, 9:43am

This review has been sponsored

Estimated Reading Time
Full Review: ~ 20 minutes
TL;DR + Pros & Cons only: 4 – 5 minutes

Hello everybody!

I’m very happy to share my next product review as part of my new partnership with Motsutoys (EU) / Onaholes (US)!

This review is also part of my website, Slibowitz Scripts – Detailed Reviews for Onaholes, Hips, Torsos and Devices, where I collect all of my reviews in one place.

Welcome back to another one of my reviews!

June and July are going to be very busy months around here, because I currently have six reviews planned in total. There are some genuinely exciting products waiting in the queue, and looking at the full selection, this may be one of the strongest review lineups I have had so far.

We are starting the marathon with another creator collaboration: the Raku VT Onahole, based on the VTuber Raku.

At first glance, the general concept may feel somewhat familiar if you have already seen my review of the SeanVR Goblin Cup. Raku is also built directly into a decorative cup-style housing, combining the character presentation and the functional toy into one complete design.

However, there is one major twist this time.

Instead of offering only a single entrance, the Raku VT features a dual-sided design with two separate access points. One side contains a mouth entrance, while the opposite side features a vaginal entrance. Both tunnels are built into the same sleeve, giving you two different ways to access the system depending on which side you choose.

Two entrances. One compromised device. And judging by the number of warning messages already appearing on my screen, this system may be far less secure than advertised.

[SYSTEM ALERT] Multiple access points detected. Firewall integrity: questionable.

Community Discount Code

You can use my code SLIBOWITZ15 to get 15% off your order.

The code works on:
Motsutoys (EU Store)
Onahole (US Store)

Using the code supports me directly at no extra cost to you — thank you for your support!

Today, I’ll be reviewing the next product they sent me to test:
RAKU: ERROR_69: SYSTEM OVERRIDE

You can find it here:
EU Store - Raku: error_69: system override
US Store - Raku: error_69: system override

About This Review

This review is structured around six key categories, each of which will receive a score from 1 to 5 (with 5 being the best) — Use Case with Devices is non rated, since it doesn’t say anything about the quality of the product itself.
At the end, I’ll provide an overall score based on the average of all six sections.

The categories I’ll be evaluating are:

Looks & Aesthetics
Quality & Build
Fitting & Handling
Texture & Internal Structure
Cleaning & Maintenance
Use Case with Devices (tested with FUNSR PRO and The Handy 2)

Let’s get into it, one section at a time!
If you have questions along the way or want to share your own experience, feel free to comment — I’d love to hear from you.

Disclaimer & Transparency

In the spirit of full transparency, here are a few important things to know about this review:

This product was provided to me for free by Motsutoys as part of our affiliate partnership.
I used the Ona Eki 370 Lube for this review.
All links in this review are affiliate links. If you choose to buy something through one of them, you’ll be directly supporting me — at no extra cost to you.
Thank you so much for considering using my affiliate links. Your support truly helps me continue doing what I love.
This product has been tested three times at the time of writing this review.
While this is a sponsored review, all opinions are my own, and I always strive to be honest, constructive, and fair in my assessments.
Motsutoys did not ask me to do this reviews, I am making this review by my own intention.
This review reflects my personal experience — every person is different, and sensations, preferences, and comfort levels may vary.

I wrote this review together with the help of ChatGPT. I provided my own key points, experiences, and thoughts for each section, and ChatGPT helped me turn those into a well-structured and professional text. So while the wording was supported by AI, the impressions, opinions, and final direction of the review are entirely my own.

Product Overview – RAKU: ERROR_69: SYSTEM OVERRIDE

Detail	Info
Price	29.95 €/$
Material	TPE
Weight	520g
Length	25 cm
Tunnel Length	25 cm
Maximum Circumference	26.4 cm
Brand	Seiraku Toys
Type	Open-Ended (Close-Ended, if cup is closed)

Detail	Info
Theme	VTuber Collab with Raku
Design	Anime
Tunnel	Vaginal tunnel
Hook	One tunnel, two different entry appearances - Vaginal + Mouth

1. Looks & Aesthetics

Raku does not arrive in traditional packaging, as the Onahole is already built directly into its own cup-style housing. In other words, the protective casing also serves as the product’s complete visual presentation.

On the outside, you are greeted by Raku herself, immediately recognizable through her striking blue hair and the surrounding glitch-inspired, computer-system aesthetic. The cup is covered with small visual details, interface elements, warning messages, and digital effects that make the design genuinely interesting to explore.

The artwork has been printed in a high and consistent quality. Everything looks clean and sharp, without any noticeably blurry sections or low-resolution elements disrupting the presentation.

Alongside the character artwork, the cup also displays useful product information. This includes the Onahole’s measurements and a visual overview of how its internal tunnel is structured. It is a practical addition that blends surprisingly well into the system-interface theme rather than feeling like ordinary product information placed on top of the design.

Of course, Raku’s main standout feature is the dual-sided construction introduced earlier. Each end of the cup has its own removable screw cap, and opening them reveals a different entrance on either side: a mouth entrance on one end and a vaginal entrance on the other.

Dual-entrance Onaholes are not unheard of, but most follow the familiar combination of one vaginal and one anal entrance. Seiraku Toys has changed that standard setup by pairing a mouth entrance with a vaginal one instead, giving Raku a more unusual identity within this product category.

It is a pretty cool concept and immediately makes the design feel more memorable.

Starting with the mouth side, the entrance features a cute and neatly crafted pair of lips. The overall appearance is somewhat simple and stylized, but that works well with the VTuber-inspired presentation. The lips still have enough shape and definition to look appealing and inviting without clashing with the illustrated character aesthetic.

Turning the cup around brings us to Raku’s vaginal entrance. Much like the mouth, it follows a cleaner and more simplified visual style rather than aiming for complete anatomical realism. However, it is not overly basic either. The labia are clearly sculpted, and the clitoris is also visible, giving the entrance enough detail to remain visually convincing.

Overall, Raku offers a strong and highly distinctive presentation. The colorful cup artwork, high-quality print, useful product information, and dual-sided construction all come together very nicely. The entrances themselves use a more stylized and simplified design, which I personally think fits the VTuber theme well.

Those looking for a highly realistic approach may find them a little too simple, but within the context of Raku’s digital and character-focused presentation, the choice makes sense.

[VISUAL SCAN COMPLETE] Two access ports confirmed. System presentation: highly optimized.

Score4.5 / 5

2. Quality & Build

Another detail that immediately stands out is the sheer size of Raku’s cup.

With a total length of 25 cm (9.84 inches), this is a remarkably long cup-style Onahole. Its maximum circumference reaches approximately 26.4 cm (10.39 inches), giving the product a substantial presence without making it feel excessively bulky.

Size comparison with Corset Girl and Otokonoko.

The outer cup is made from hard plastic and feels extremely sturdy. There is no cheap or fragile impression here—the housing feels solid, durable, and well assembled. This is especially important for a product with removable caps on both ends, as the construction needs to remain secure regardless of which side is currently in use.

Raku weighs approximately 520 g (1.15 lbs), which creates a very good balance. She feels substantial enough to remain stable and well built, but not so heavy that holding or repositioning the cup becomes uncomfortable during longer sessions.

At the time of writing, Raku is available for 29.95 €/$.

Inside the hard plastic housing, the actual Onahole is made from TPE. The material is very soft and carries the familiar softness I have come to associate with products from Seiraku Toys. It feels flexible and comfortable while still remaining securely fitted inside the cup.

Overall, Raku delivers excellent build quality. The outer housing is sturdy and dependable, the weight is nicely balanced, and the soft TPE complements the solid cup construction extremely well.

There is very little to criticize here. From the durable casing to the material quality inside, the entire system feels properly assembled and ready for repeated access attempts.

[SECURITY SCAN COMPLETE] Outer shell reinforced. Internal system soft, stable, and fully operational.

Score5 / 5

3. Fitting & Handling

Let’s begin by looking at how well Raku accommodates different sizes, starting with the mouth entrance.

At first glance, the opening appears fairly tight, and that impression carries over into actual use. Entering requires a little pressure, as the lips do not open quite as effortlessly as they might on a more spacious or flexible entrance.

Standard girth and below should still fit without any major issues, although even a standard girth may require a small push during entry. Those above standard girth could face more resistance here and may find the initial entrance somewhat challenging.

Once inside, however, the experience changes significantly.

The tunnel opens into a much wider internal structure, making the actual fit far more accommodating than the entrance initially suggests. Once the first section has been passed, Raku should comfortably fit a broad range of sizes. The main challenge is therefore not the tunnel itself, but simply getting through the tighter opening.

The vaginal entrance behaves in much the same way. It also requires a little pressure during entry, and users above standard girth may encounter some difficulty at first. Once inside, though, the tunnel becomes noticeably wider and should accommodate almost everyone comfortably.

Handling and Suction

Handling Raku is particularly interesting—not only because of her relatively long cup design, but because of one of the most important features this type of housing can provide:

Suction.

And in Raku’s case, that suction is extremely strong.

Those who have used the SeanVR Goblin Cup may already be familiar with the additional suction a closed cup can create. However, Raku feels significantly stronger in this regard.

The removable caps allow you to adjust the airflow and, with it, the strength of the suction:

Keeping the opposite cap completely closed creates the strongest suction.
Loosening the cap slightly allows more airflow and reduces the resistance.
Removing the cap almost entirely releases the pressure and makes the suction much weaker.

Some suction may still remain even with the cap removed, but the difference is substantial.

With the cup fully closed, the resistance is very noticeable. Moving Raku up and down requires more effort than using a standard open-ended Onahole. It is not exhausting, but you will certainly feel that you are working against the vacuum inside.

Using two hands can make the movement easier and more controlled, especially during longer sessions. One-handed use is still entirely possible, but the strong suction makes two-handed handling the more comfortable option when you want to maintain a consistent rhythm.

Noise Levels

The suction also creates a noticeable amount of sound.

Whether this is a downside will depend heavily on personal preference. Some may find the noises distracting or slightly annoying, while others may enjoy them as part of the experience. This is especially true when using the mouth tunnel, where the suction sounds can add a surprising amount of immersion.

The noise becomes more pronounced when the opposite cap is loosened or removed, as the changing airflow creates louder suction and release sounds.

When the opposite cap is removed completely, the unused entrance may also bend or pull inward during movement. This happens because the movement inside the sleeve changes the air pressure throughout the shared internal space. Without the closed cap helping to stabilize the pressure, the softer TPE at the unused entrance is pulled inward as the material compresses and expands.

This can create additional sound, particularly when the entrance repeatedly flexes back into position.

In most situations, however, this should not have a major impact on the experience. You will likely want to keep the opposite cap fully closed anyway, as that is where Raku’s excellent suction truly becomes a standout feature.

Overall, both entrances may require a little effort during the initial entry, especially for users above standard girth. Once inside, the tunnels become far more spacious and accommodating.

Handling requires slightly more strength due to the powerful suction, and the cup can become fairly noisy depending on how the opposite cap is positioned. However, these are relatively minor compromises for one of Raku’s most enjoyable and distinctive features.

The suction adds a great deal to the overall feel—and I will explore exactly how much it changes the experience in the next section.

[PRESSURE WARNING] Vacuum resistance exceeding standard parameters. Additional processing power recommended.

Score4.5 / 5

4. Texture & Internal Structure

Now that we have successfully passed the entry firewall, let’s see what Raku has to offer beneath the surface.

With a tunnel length of approximately 25 cm (9.84 inches), Raku provides more than enough depth for almost everyone. Both entrances lead into their own distinct texture, and the differences between them are clearly visible in the endoscope footage.

Mouth

Vaginal

Despite sharing the same sleeve, the two sides do not feel identical. Each access point offers its own internal structure and a slightly different type of stimulation.

Pop-Up Pucker Portal – Mouth Tunnel

We will begin once again with the mouth side, officially known as the Pop-Up Pucker Portal.

This side is divided into two named zones:

Malware “Mmwah” Mouth – the entrance
Sussy Spin System – the internal tunnel

Beyond its wonderfully chaotic naming scheme, the mouth follows a relatively straightforward construction. It consists of a straight tunnel covered with closely spaced ribs from beginning to end.

There are no sudden chambers, dramatic contractions, or unexpected texture changes waiting deeper inside. It is simply a soft, ribbed tunnel—and that simplicity works surprisingly well.

The ribs sit close together, creating a consistent sensation throughout the entire stroke. Rather than delivering individual, aggressive texture hits, they produce a smoother and more continuous form of stimulation.

The experience is gentler than many heavily textured Onaholes, but it is still more stimulating than I initially expected. The ribs remain clearly noticeable without ever becoming rough, overwhelming, or irritating.

The material is also very soft. However, it does not become so soft that the internal texture disappears under pressure. There is still enough structure behind the ribs for them to remain present during use.

On my softness scale, I would rate the mouth tunnel at:

Softness: –2/3 – Very Soft

For intensity, it lands at:

Intensity: +1/3 – Slightly Intense

Root Access – Vaginal Tunnel

Turning Raku around brings us to the vaginal side, known as Root Access.

This tunnel is also divided into two named zones:

Core Login Lips – the entrance
Virus Vortex Node – the internal tunnel

The vaginal side follows a similarly simple philosophy, but replaces the ribbed texture with evenly distributed knobs throughout the tunnel.

The knobs are medium-sized. I have encountered both considerably larger and much smaller examples in other products, and Raku lands somewhere comfortably between the two.

Their size creates a good balance. They are not so large or prominent that they dominate the entire experience, but they are substantial enough to remain noticeable and provide consistent stimulation throughout each stroke.

Personally, I found the vaginal tunnel slightly more stimulating than the mouth. The knobs felt more distinct to me than the closely spaced ribs, giving this side a somewhat stronger and more present sensation.

However, the difference is not dramatic. Sensitivity and texture preferences are always highly individual, so someone else may easily prefer the mouth side or perceive the two tunnels differently.

The vaginal tunnel uses the same very soft material as the mouth side. On the scales, I would therefore rate it identically:

Softness: –2/3 – Very Soft

Intensity: +1/3 – Slightly Intense

Although I personally found it a little more stimulating, the difference is not large enough to justify moving it into a higher intensity category.

Lubrication

A moderate amount of lubricant should be sufficient for either side.

Raku does not require an excessive quantity, but I would avoid using too little. The powerful suction creates additional resistance and pressure inside the tunnel, so having enough lubricant helps keep the movement smooth and comfortable.

You can always begin with a moderate amount and add more if necessary.

The Suction Protocol

The suction deserves its own discussion because it is not merely a secondary feature of Raku.

It is arguably the feature that defines the entire experience.

The suction is exceptionally strong and remains present throughout use when the opposite cap is fully closed. Describing exactly how suction feels can be difficult, as different users respond to it in very different ways. For me, however, it significantly enhances both tunnels.

Without the suction, the textures feel good, but relatively conventional. The ribbed mouth and knobbed vaginal tunnel are both pleasant, soft, and stimulating, yet their simple construction can lack a little impact on its own.

Activating the full suction changes that.

The vacuum adds resistance, pressure, and a much stronger sense of contact around the entire tunnel. It makes both textures feel more intense and gives the experience the extra impact that the straightforward internal structures might otherwise be missing.

For that reason, I strongly recommend keeping the opposite cap fully closed whenever possible.

Embrace the suction.

It is not an error. It is not a bug. It is the core feature of Raku’s operating system.

Climax

The suction also has a substantial effect on the climax.

Without it, the climax would still be enjoyable—a good, dependable standard experience. With the system fully sealed, however, it becomes noticeably stronger and more distinctive.

The continuous vacuum changes the sensation in a way that is difficult to replicate with a standard open-ended Onahole. It adds pressure throughout the climax, making it feel more intense and somewhat different from an experience without suction.

It is difficult to translate that precise sensation into words, but the improvement is immediately noticeable during use.

Final Texture Assessment

Raku takes a simpler approach to internal texture, and I do not consider that a weakness by default.

In a market filled with elaborate chambers, unpredictable tunnel changes, and increasingly aggressive texture patterns, there is absolutely room for products that focus on a more consistent and approachable experience.

Neither tunnel overstimulates, feels rough, or becomes annoying during longer use. Both remain gentle and comfortable while still delivering enough texture to be clearly felt.

Users searching specifically for highly aggressive or complex stimulation may find Raku a little too basic. The ribs and knobs are not designed to overpower you, and without the suction, the tunnels may lack some of the impact those users are looking for.

For anyone who prefers softer, more consistent textures, however, Raku performs very well.

Switching between the tunnels during use is also genuinely fun. They feel different enough to justify the dual-sided construction: the mouth provides the gentler, smoother experience, while the vaginal side feels slightly more present and stimulating.

Most importantly, the suction elevates both sides considerably. I have personally never experienced another Onahole with suction this strong, and it gives Raku a genuinely memorable identity.

Use the sealed cup. Activate the vacuum. Let the system breach begin.

[ROOT ACCESS SUCCESSFUL] Texture protocols stable. Vacuum enhancement operating far beyond recommended parameters.

Score4.5 / 5

5. Cleaning & Maintenance

Despite Raku’s considerable length, the cleaning process is surprisingly manageable.

I initially expected the 25 cm (9.84-inch) sleeve to require considerably more work, but the dual-sided construction becomes a major advantage here. Since both ends can be opened, water can pass completely through the tunnel rather than becoming trapped deep inside it.

Once you are finished, remove both caps and flush the sleeve thoroughly from each side using lukewarm water. Allowing the water to run directly through the entire tunnel helps carry out most remaining lubricant and residue immediately.

This open construction is one of Raku’s strongest practical features.

Removing the Sleeve

I recommend removing the Onahole from its plastic housing before cleaning it.

Technically, you could attempt to rinse it while it remains inside the cup, but water will eventually find its way between the sleeve and the housing. If moisture becomes trapped inside the cup and is not dried properly, it may create an environment where mold can develop.

That is an unnecessary system failure and one that is easy to prevent.

Remove the sleeve first, then flush it thoroughly under lukewarm water. Gently scrub the internal textures with your fingers to make sure the ribs and knobs are properly cleaned.

Reaching the deepest areas can take a little effort because of the sleeve’s length. However, the TPE is very soft and flexible, allowing you to compress and reposition the material as needed. Since the tunnel can also be accessed from both ends, cleaning the center is easier than the dimensions initially suggest.

Drying

After rinsing, dry the outside with a fresh microfiber cloth.

For the inside, you can wrap part of the cloth around a finger and carefully work from both openings. The total length means this requires a little patience, but approaching the tunnel from either side makes the process entirely manageable.

Microfiber drying sticks are especially useful here. They can reach farther into the tunnel and speed up the drying process considerably.

In total, cleaning and manually drying Raku takes me approximately five to six minutes.

Once the majority of the moisture has been removed, leave the sleeve outside the cup and allow it to air-dry completely. Only reinstall it once both the sleeve and the inside of the housing are fully dry.

Reassembly

Putting the Onahole back into the cup is relatively easy, and the soft material can be guided into place without much difficulty.

However, take a little care around the inner edges of the plastic housing near both entrances. These edges are somewhat sharp and can feel uncomfortable if you press your fingers against them carelessly.

They are not dangerously sharp, but they can certainly be annoying enough to catch you by surprise. Slow and controlled reinstallation avoids the issue entirely.

Long-Term Maintenance and Storage

Ongoing maintenance is very simple.

Apply renewal powder occasionally to help the TPE retain its smooth surface and reduce unwanted stickiness. A dedicated toy cleaner can also be used periodically when you want to perform a more thorough cleaning.

Despite being longer than the average cup-style product, Raku should still fit into most standard drawers. You may simply need to store her lengthwise rather than upright.

Overall, Raku is easier to clean than expected. The ability to open both ends makes flushing, inspecting, and drying the tunnel far more convenient. Removing the sleeve adds an extra step, but it is worthwhile for keeping moisture out of the housing and protecting the product over time.

[SYSTEM PURGE COMPLETE] Residual files removed. Moisture detected: 0%. Reboot authorized.

Score4.5 / 5

6. Use Case with Devices

Raku may look like a promising candidate for automated devices, especially because the hard plastic housing is sturdy enough to sit securely inside many holders.

However, I would not recommend using her with devices.

The first issue is the overall length. At approximately 25 cm (9.84 inches), Raku is considerably longer than a standard cup or sleeve, which can already make positioning more awkward depending on the device and mounting setup.

The bigger concern, however, is the suction.

Raku’s fully sealed cup creates an exceptionally strong vacuum. This is one of her greatest strengths during handheld use, but it could become a problem when paired with a motorized device. The machine would constantly have to work against the additional resistance created by the suction, placing unnecessary strain on its motor and moving components.

Even if a device appears capable of handling it, I would rather avoid creating that extra workload over longer periods.

You could loosen or remove the opposite cap to reduce the suction, but that introduces another problem: the vacuum is one of the main reasons to choose Raku in the first place. Using her with heavily reduced suction would mean sacrificing the product’s most distinctive and enjoyable feature simply to make automated use more manageable.

Using the Sleeve Without the Cup

Removing the TPE sleeve from its housing and strapping it directly into a device holder is an even worse option.

The sleeve is long, extremely soft, and flexible. Without the rigid cup supporting it, the material would bend and flop around during movement instead of remaining securely aligned.

That lack of stability could lead to poor positioning, uncontrolled movement, or the sleeve slipping partially out of the holder. In my opinion, this setup would be far too unreliable and unsafe to recommend.

Overall, Raku works best exactly as intended: inside her own housing and under manual control.

The cup provides stability, handheld use gives you full control over the resistance, and the sealed system allows the powerful suction to operate without placing unnecessary stress on external hardware.

Raku does not want to connect to another device.

She wants root access to remain local.

[CONNECTION FAILED] Unauthorized hardware detected. Raku will remain inside her native system.

Tips & Advice

Raku has more to offer than a quick glance at the cup may suggest, so take a moment to explore the design before use.

The outer artwork contains plenty of small glitch effects, system references, interface details, and product information. It is one of those presentations that becomes more enjoyable the longer you look at it.

Use Both Sides

Do not limit yourself to only one entrance.

The mouth and vaginal tunnels use different textures and create noticeably different sensations. The mouth provides the softer, smoother ribbed experience, while the vaginal tunnel feels slightly more present through its knobbed structure.

Switching between them during use is also part of the fun and helps the dual-sided design feel meaningful rather than purely decorative.

Experiment With the Suction

The suction is Raku’s defining feature, so I strongly recommend making use of it.

Keeping the opposite cap fully closed creates the strongest vacuum and the most intense version of the experience. However, that does not mean maximum suction will automatically be the best setting for everyone.

Try loosening the cap slightly to allow more airflow and reduce the resistance. You can also remove it completely for a much lighter level of suction.

These small adjustments create several noticeably different configurations, so experiment until you find the balance that feels most comfortable.

Use Microfiber Drying Sticks

Microfiber drying sticks make the cleaning process considerably faster and easier.

The sleeve is long, and although both ends are accessible, reaching the center with only a cloth and your fingers can take some patience. A drying stick reaches deeper into the tunnel and helps remove moisture more efficiently.

Be Careful During Reassembly

When placing the sleeve back into the plastic housing, pay attention to the inner edges around both openings.

They are not dangerously sharp, but they can feel uncomfortable if your fingers press against them at the wrong angle. Guide the soft TPE into position slowly rather than forcing it through the opening.

[USER SETTINGS UPDATED] Dual access enabled. Vacuum strength adjusted. Safety protocols active.

Pros & Cons

Pros

Unique dual-sided design with both a mouth and vaginal entrance
Strong visual presentation with detailed artwork, glitch effects, and system-themed design elements
High-quality print with sharp details and no blurry sections
Very sturdy plastic housing that feels durable and well built
Soft, flexible TPE with the familiar Seiraku Toys softness
Excellent weight balance—substantial without becoming too heavy
Very long tunnels that should accommodate almost everyone
Two distinct internal textures that feel different enough to justify switching sides
Extremely strong suction that adds a lot of intensity and gives Raku a genuinely unique character
Adjustable suction by tightening, loosening, or removing the opposite cap
Comfortable stimulation that remains gentle without becoming dull
Open-ended construction makes flushing and cleaning easier than expected
Relatively quick cleaning process despite the overall length
Easy maintenance and storage
Fun and memorable overall concept, especially for fans of Raku or VTuber collaborations

Cons

Both entrances are somewhat tight, which may make initial entry difficult for users above standard girth
Strong suction increases resistance, making longer sessions slightly more demanding
Can become fairly noisy, especially when the opposite cap is loosened or removed
Unused entrance may bend inward when the opposite side is left open
Internal textures are relatively simple, which may disappoint users who prefer aggressive or highly complex structures
The suction is almost essential to get the best experience from the tunnels
Not recommended for motorized devices due to the strong resistance and overall length
Unsafe to use in devices without the outer housing, as the soft sleeve lacks stability
Inner edges of the cup can feel slightly sharp during reassembly
The long tunnel requires a little extra effort to dry fully

[DIAGNOSTIC COMPLETE] Strengths detected: numerous. Critical failures detected: none.

TL;DR – Final Verdict

The Raku VT Onahole is a fun, creative, and surprisingly distinctive collaboration product that combines a strong visual presentation with a genuinely useful dual-sided design.

Instead of following the usual vaginal-and-anal combination found in many dual-entry Onaholes, Raku offers a mouth tunnel on one side and a vaginal tunnel on the other. Both entrances lead into their own internal texture, with the mouth using closely spaced ribs and the vaginal side relying on evenly distributed medium-sized knobs.

The textures themselves are relatively simple. Neither side delivers an overly aggressive or highly complex experience, but both remain comfortable, consistent, and stimulating enough to avoid feeling dull. The mouth feels a little gentler and smoother, while the vaginal tunnel is slightly more present and noticeable.

What truly defines Raku, however, is the extremely strong suction.

With the opposite cap fully closed, the vacuum adds a huge amount of pressure, resistance, and intensity to both tunnels. Without it, the textures are good but somewhat standard. With it, Raku becomes far more memorable and delivers a sensation that feels noticeably different from a conventional open-ended Onahole.

The suction can also be adjusted by loosening or removing the opposite cap, allowing you to experiment with several different resistance levels. Maximum suction requires a little more effort during handling and can make the cup fairly noisy, but it is absolutely the configuration I would recommend using.

Build quality is excellent. The outer housing is sturdy, the print is sharp and detailed, and the TPE is very soft without losing too much texture definition. Despite the considerable length, cleaning is easier than expected because both ends can be opened and flushed through. Removing the sleeve from the housing is still recommended to prevent water from becoming trapped inside the cup.

Raku is not a product I would pair with automated devices. The strong vacuum would create unnecessary resistance for the motor, while the long and very soft sleeve is too unstable to use safely without its housing.

Overall, Raku is best suited to users who enjoy soft textures, strong suction, adjustable resistance, and unusual product concepts. Those looking for an extremely intense or structurally complex tunnel may find her a little basic, but anyone who appreciates a gentler texture enhanced by powerful suction will find plenty to enjoy here.

Raku may not breach the system through texture complexity alone—but once the vacuum protocol activates, the firewall does not stand much of a chance.

[FINAL SYSTEM REPORT] Dual access successful. Root privileges granted. Firewall compromised beyond repair.

Final Rating

Looks & Aesthetics: 4.5/5
Quality & Build: 5/5
Fitting & Handling: 4.5/5
Texture & Internal Structure: 4.5/5
Cleaning & Maintenance: 4.5/5

Total Score4.6 / 5

What a cool way to begin the new review marathon.

Raku turned out to be a strong opening product and a great example of how a creator collaboration can offer more than just character artwork placed onto an existing design. The dual-sided construction, detailed cup presentation, and unusual combination of a mouth and vaginal tunnel give the product its own clear identity.

However, the real highlight is undoubtedly the suction.

I have tested plenty of Onaholes by now, but I have never experienced suction this strong from one before. It remains present throughout the entire session, adds noticeable resistance, and enhances both tunnels far beyond what their relatively simple textures would achieve on their own.

I genuinely enjoyed the experience it created.

Raku was fun throughout my testing and offered something that felt different from the majority of traditional Onaholes. The ability to adjust the suction by tightening, loosening, or removing the opposite cap also adds a welcome amount of control. You can begin with lighter resistance and gradually increase it until you find the setting that works best for you.

The biggest potential drawback is the simple internal structure.

Those looking for highly aggressive textures, dramatic chamber changes, or unpredictable tunnel designs may find Raku somewhat basic. Both sides rely on consistent structures—the mouth on ribs and the vaginal tunnel on knobs—without offering many additional variations.

However, I do not think every Onahole needs to become a texture overload.

More aggressive products can occasionally feel overwhelming, particularly for newer users or anyone who prefers softer and more comfortable stimulation. Raku’s simpler approach makes her easier to understand, easier to enjoy, and less likely to become irritating during longer sessions.

That also makes her an excellent beginner-friendly option, especially for anyone interested in exploring suction for the first time. The textures remain gentle, the material is very soft, and the adjustable vacuum allows the intensity to grow alongside your experience.

Overall, Raku delivers a creative collaboration, very good build quality, two enjoyable tunnels, and one of the strongest suction experiences I have encountered so far.

A really cool product—and a powerful first breach into the upcoming review lineup.

[FINAL BREACH REPORT] System compromised successfully. Suction protocol exceeded all previous benchmarks. Review marathon officially online.

Onahole Comparison Table

With every new review I publish, I’ll also update this growing comparison table. The goal is to give you a quick, at-a-glance overview of how different products stack up against each other — from intensity and realism to device compatibility and cleaning effort.

This way, you don’t just see how the product performs on its own, but also where it stands compared to others I’ve tested. Over time, this table will become a handy reference guide for anyone curious about how these Onaholes differ in feel, usage, and overall value.

Newest product always on top, oldest on the bottom — the table will grow with each review.

Hover over the table and click on “extend table” to fully see the comparison table.

Product	Intensity	Theme / Realism	Best For	Lube Usage	Cleaning Difficulty	Not Ideal For	Best Use Case	Device Use	Texture & Firmness	Size & Weight	Value for Money
Raku	Medium	Anime / V-Tuber	Short - long sessions	Moderate	Easy	Very girthy users, devices	Manual	Not compatible	Soft, ribbed and knobbed texture, medium intensity, strong suction	520g, 25cm tunnel length	Very good (29.95 €/$)
Well-Rounded Girl	Medium	Chubby / Anime	Short - long / edging sessions	Moderate - More	Easy	Very girthy users	Manual / Devices	FUNS PRO, Handy 2	Very soft, intense but soft vaginal tunnel, tighter anal tunnel	520g, 12.5 cm vaginal, 10 cm anal	Good (49.95€/$)
Big Slut Angel 2	High	Anime	Medium sessions	Needs a lot	Easy	Devices	Manual	Not compatible	Intense rich texture, wider vaginal, more narrow anal, flexibel	1.5 kg, 15 cm vaginal tunnel, 13 cm anal tunnel	Premium (69.95€/$)
Corset Girl	Medium - High	Anime	Short - medium - long - edging sessions	More	Easy	Devices	Manual	Not compatible	soft, rich texture, more intense, snug, flexibel	980g 14.5 cm	Good (39.95 €/$)
Peach Ball Onahole	Low / Medium	Anime	Short sessions / edging sessions	Moderate	Easy	Devices / Very girthy users	Manuel	Not compatible	snug, soft, smooth, squishy	360g, 5 cm	Very good (17.95€/$)
Deep Throat Hunter	High	Realistic	Short - long sessions	Moderate	Easy	Very girthy users	Manual / with devices	FUNS PRO, Handy 2	smooth beginning, high textured end, tighter, but flexibel	549g, 16.5cm	Good (39.95 €/$)
SeanVR Goblin Cup	Medium	Anime / V-Tuber	Short - medium sessions	More	Easy	Girthy users	Manua l/ Handy 1 / 2	FUNS PRO, Handy 2 (without cup)	soft, smoother, medium textured	250g / 15 cm	Very good (27.95€/$)
Panzer Duo	Medium / High	Anime	Medium sessions / smaller sizes	Moderate	Easy	Longer sizes / girthy users	Manual / Handy 1 / 2	FUNSR1, Handy 2	Tight, soft, smoother texture	430g, 10.5 cm and 9.5 cm	Good (39.95 €/$)
Dress in Secret	Medium / High	Clothes	Short / Edging	Moderate	Easy	Wide girth	Manual / Handy 1/2	Handy 2, FUNSR1	Tight, high suction, soft, simple textures	125g, 7.9cm	Very good (19.95€/$)
Slut Angel DX 1200	Medium / High	Anime	Short / Medium sessions	Moderate	Easy	Very wide girth / long sessions	Manual / standing & seated	FUNSR1, Handy 2	More tight, medium firmness, rich vaginal texture	1.2kg / 13.5 cm vaginal tunnel / 14 cm anal tunnel	Good 49.95€/$
Rika Likes Anal	Medium	Anime / Anal	Short / Medium / Long Edging	Moderate	Easy	-	Manual / Handy 2 or FUNSR	Handy 2, FUNSR1	Wider, medium firmness, squishy, flexible	12.5 cm, 700 g	Good 39.95€/$
Cute Dragon Impregnated	Very High	Fantasy	Short / Medium sessions / Edging	Needs a lot	Medium	Very wide girth	Manual / FUNSR1	FUNSR1, Handy 2	Tight, firm, intense texture	14 cm tunnel, 350g	Premium (69,95 €/$)
Lewd and Seductive Maid	Medium	Realistic	Medium / long sessions	Moderate	Medium	Short Sessions	Standing & Seated, (immersive, with FUNSR1)	FUNSR1, Handy, Handy 2	Wider / tight, soft, squishy, realistic texture	~17 cm tunnel + ~ 15 cm tunnel 870 g	Premium (79.95€)
Bread de Ecstasy	High	Fantasy – Bakery	Quick Sessions	Needs a lot	Hard	Long Sessions	Standing & Seated	FUNSR1, Handy, Handy 2	Tight. rich, firm, stimulating, varied	~20 cm tunnel / 935 g	High (49.95 €/$)
Brain Hacker DX	Low	Fantasy – Brain	Long Sessions	Needs less	Hard	Short Sessions	Standing (immersive, with FUNSR1)	FUNSR1, Handy, Handy 2	Wide, soft, very squishy, gradual textures	18 cm tunnel / 1.2 kg	Premium (69.95 €/$)
Urethral Twist	High	Fantasy – Futa	Medium Sessions	Moderate	Easy	Very wide girth	With devices (Handy/FUNSR)	FUNSR1, Handy, Handy 2	Tight spiral, medium firmness, intense	14 cm tunnel / 360 g	Very good (19.95 €/$)
Nezuko Double Tooth	Medium	Anime – Character	Medium Sessions	Moderate	Medium	Very short girth	Manual or with device	FUNSR1, Handy, Handy 2	Wide, teeth + tongue details, medium soft	17 cm tunnel / 640 g	High (59.95 €/$)
Gokusai Uterus	High	Realistic	Medium Sessions	Moderate	Medium	Long Sessions	Manual or with device	FUNSR1, Handy, Handy 2	Tight, realistic uterine textures, firmer	~14 cm tunnel / 480 g	Good (34.95€/$)

Closing Words

Thank you very much for reading!

As always, a huge thank-you goes to Motsutoys for their continued trust and for making reviews like this possible. I am genuinely grateful for the partnership and for the opportunity to keep exploring such unusual and creative products.

I hope you enjoyed the review and found it both informative and entertaining.

This was only the beginning of the new review marathon. Five more reviews are still coming, and as I mentioned at the start, the lineup for June and July is strong.

Very strong.

Next time, we are taking a closer look at another very special and exciting collaboration. The battle of the JAV stars has officially begun—and somehow, I have ended up caught directly in the middle of it.

What do you think about collaborations like Raku?

Are you interested in VTuber-themed products, and would you like to see more of them in the future? If so, which VTuber would you most like to see featured in a collaboration?

Thank you again for reading, and I will see you in the next review!

– Slibowitz

[SESSION CLOSED] Connection terminated successfully. Five additional files remain in the review queue.

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You can use my code SLIBOWITZ15 to get 15% off your order.

Thank you so much for considering it!

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