Yunyun Syndrome!? Rhythm Psychosis

Yunyun Syndrome!? Rhythm Psychosis

Released Apr 2026

“Yunyun Syndrome!? Rhythm Psychosis” is a rhythm adventure game about a psychotic hikikomori girl - also an avid anonymous poster - who corrupts the world with her severe brain rot from listening to too many denpa songs. Yunyun all over this ♡♡♡♡ world with your degen otaku-posting.

91% positive · 4,404 reviews
Not yet
Released, but content still planned
High confidence
Content Planned
Not yet
Released, but content still planned
High confidence
Content Planned

Where to buy

Steam $13.59 $16.99 −20%
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Evaluation

Yunyun Syndrome!? Rhythm Psychosis launched on April 23, 2026, and the developer has maintained consistent post-launch communication and updates. All 7 listed DLC items — extra song packs from various artists, a soundtrack, and a digital artworks pack — were released at or shortly after launch. The most recent update, Ver. 1.2.0 on October 1, 2026, explicitly states: "Beyond this update, we plan to keep adding new songs and, above all, continue improving the game with updates that make its Denpa even stronger." This is a direct, unambiguous statement of intent to add new song content going forward. The same forward-looking commitment to new songs and ongoing updates appeared in the Ver. 1.1.0 patch notes on June 30, 2026, and in the Ver. 1.0.9 notes on June 1, 2026 — making this a sustained, consistent developer position rather than an offhand remark. The developer (WHO YOU / Fuyuki Hayashi) has remained visibly active, releasing multiple patches addressing gameplay systems, quality-of-life features, localization improvements, and bug fixes since launch. New songs have been explicitly called out as upcoming content as recently as October 1, 2026.
Evidence
Ver. 1.2.0 patch notes state: 'Beyond this update, we plan to keep adding new songs and, above all, continue improving the game with updates that make its Denpa even stronger.'
news post · Oct 1, 2026 source content planned
high
Ver. 1.1.0 patch notes state the developer is 'preparing updates such as adding new songs' and confirms plans to continue updating the game.
news post · Jun 30, 2026 source content planned
high

Content

9 of 9 released · no outstanding content

Media

Details

Developer
Publisher
Alliance Arts
Achievements
49
Platform
Windows
Controller
partial support
Steam Deck
Playable
Players
Single-player

About this game

High and vibin’ with denpa songs, we’ll corrupt the entire Internet! Hehe. all we need is a bit of otaku love, that’s all.

This is a rhythm-adventure game where you play as a hikikomori (shut-in) girl who’s high on denpa songs. Become Yunyun-brained and lose all self-control to anonymously post on social media and destroy the world with your Yunyun brain rot.

Have a Doki-Doki experience with over 30 denpa songs and multiple endings.

Q. Why did she become a hikikomori?

Q. How does anonymous online posting lead to world destruction?
Q. Does a happy ending exist for a degenerate otaku?

The answers to those “Q” s lie at the convergence of insanity and denpa psychosis.
Now, put those headphones on and become ill with Yunyun Syndrome!? Rhythm Psychosis.

⚡ Anonymously post online and infect the whole world with Yunyun-brain!

Get high on denpa songs and spread your heartful psychosis to everyone else!

⚡Characters!

・Qtie (CV:Nanahira)

The main character. A hikikomori. She suffered too much irl that she’s become a little (very) fuzzy in the head. Her obsessive love for the fictional character “Yunyun” is for sure an illness. Her overly “high” state from overdosing denpa songs causes her to propagate Yunyun love. Will there really be a happy end for such a degenerate otaku?

・Yunyun (CV:Haruko Momoi)
A fictional character that loves Qtie. A very much angelic devil. She will speak to Qtie through the monitor screen. Whilst the truth is unknown, most likely, she is just a figment of Qtie's imagination. It’s joever for her.

⚡About DenpaSongs!

Q. What is a “denpa” song?
It is a genre of music that is intentionally strange and catchy. All playable songs in this game are denpa songs.
Many popular denpa songs such as “it’s a cherry kissing explosion” (Sakuranbo Kiss) and many more are featured!

▶Original Songs

1.Denpa-tic Imaginary Girl "Q"

2.Peak Ecstasy!! Rim de Lacent☆

3.YUNYUN HARDCORE

4.???

5.???

▶Licensed Songs

6.Achichi na Natsu no Monogatari

7.Change my Style~Anata gonomi no Watashi ni~

8.Cirno's Perfect Math Class

9.CosmicKING☆sens@tion!!!!!!!!

10.Dakko Shite Gyu!

11.Gacha Gacha Cute Figu@mate

12.INTERNET OVERDOSE

13.INTERNET YAMERO

14.Kanbu de Tomatte sugu Tokeru Kyoki no Udongein

15.Kyururun Kiss de Janbo♪♪

16.Love Cheat!

17.Marisa stole the precious thing

18.Mighty Heart ~Aru Hi no Kenka, Itsumo no Koigokoro~

19.Miko Miko Nurse - Ai no Theme

20.Nee,...shiyou yo!

21.PETTAN PETTAN TSURUPETTAN

22.Princess Brave!

23.Princess Bride!

24.Raspberry

25.sakuranbokissu~bakuhatsudamo~n~

26.Senno Sakushu Tora no Maki

27.Shukusei!! Loli Kami Requiem

28.summer is machine gun

29.true my heart

30.winter is machine gun

31.MuseDashを作っているPeroPeroGamesさんが倒産しちゃったよ~

32.MEGA TSKR

33.Mecha Koi Ranman☆

34.RORO JUMP! (feat. CHiNCHiYA)

35.Strawberry Cake

36.Quit being a maid? Quit being a human?

♥Listen up!

Do you like cute anime girls? Do you like strange and catchy denpa songs? Do you wish for the death of this ♡♡♡♡ed up world? Great! Add “Yunyun Syndrome!? Rhythm Psychosis” to your WishList and stay updated for release information and updates!

Last evaluated Oct 2, 2026
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