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Watch trailer on Steam ↗Yunyun Syndrome!? Rhythm Psychosis
Alliance Arts, WHO YOU · Published by Alliance Arts
Very Positive — 91% positive (4,345 reviews) · 49 achievements
Last updated 28 Sept 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.
£11.49
Lowest price we've ever recorded
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Price history
Adventure, Indie, Simulation · 2026 · More £5 - £15 games
Embark on Yunyun Syndrome!? Rhythm Psychosis, an indie adventure where you navigate through the mind of a delusional poster-child for anonymous online culture. Experience this unique simulation that blends rhythm and reality as you journey with WHO YOU’s quirky protagonist.
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
♥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!
System Requirements
Will my PC run this? →Minimum
- OS: Windows 10, 11 (64bit)
- Processor: Core™ i5-9400
- Memory: 8 GB RAM
- Graphics: GeForce® GTX 1050 Ti 4GB
- Storage: 3 GB available space
Recommended
- OS: OS: Windows 10, 11 (64bit)
- Storage: 3 GB available space
Supported Languages
*languages with full audio support
Latest news
Patch NotesOfficial
Patch Notes Ver. 1.1.0
▶ Update to Ver. 1.1.0· Expanded the sort and search features for “Songs”· Added a feature that allows note speed to be adjusted during rhythm game play· Added per-song audio sync adjustment, also known as local offset· Added more areas that can be controlled using only the keyboard· Adjusted volume so they can be set separately for story parts and rhythm game parts· Adjusted the rhythm game start animation so it can be skipped· Added a feature to display judgment distribution· Added unhinged posts from the “Yunyun Unhinged Post Submission Campaign”· Fixed other minor bugsTo help Yunyun Syndrome!? Rhythm Psychosis be transmitted to even more people, we are also preparing updates such as adding new songs and reviewing the text.We are planning to continue updating the game, so we would be very happy if you could keep helping us spread the signal of Yunyun Syndrome!? Rhythm Psychosis together.Read full article on Community Announcements (WHO YOU)AnnouncementsOfficial
100,000 copies sold!
Total sales of the main game "Yunyun Syndrome!? Rhythm Psychosis" have surpassed 100,000 copies!To everyone who tuned in to our denpa. Thank you from the bottom of our hearts!Read full article on Community Announcements (STREAM)Patch NotesOfficial
Patch Notes Ver. 1.0.9
▶ Update to Ver. 1.0.9· Adjusted special dialogue to play on the title screen on specific dates· Adjusted the HARDCORE GAMER and NORMAL ratings, which were internally identical, by unifying all ratings except DEGENERATE (NORMAL, HARDCORE GAMER, TRYHARD) and correcting the description text in HELP・Updated the Closed Beta Test participant list in the credits· Fixed minor bugs such as typos in textWe will keep doing our best so that Yunyun Syndrome!? Rhythm Psychosis can be transmitted to even more people, and above all, so that it can make your kokoro more dokidoki through its signal.We are planning to continue updating the game, so we would be very happy if you could keep helping us spread the signal of Yunyun Syndrome!? Rhythm Psychosis together.Read full article on Community Announcements (WHO YOU)AnnouncementsOfficial
Notice of Demo Version Distribution End
Thank you for playing Yunyun Syndrome!? Rhythm Psychosis. We would like to inform you that distribution of the demo version will end at May 7 at 2:00 AM PT. This decision was made because it has become difficult to keep the demo version aligned with ongoing updates to the full product, making it no longer feasible for the demo to properly serve its intended role. In addition, we have received reports from other players alleging misuse of the demo version for cracking-related activities. We sincerely apologize for any inconvenience this may cause to those who are currently playing the demo, and we appreciate your understanding.Read full article on Community Announcements (STREAM)Patch NotesOfficial
Patch Notes Ver. 1.0.8 & 50,000 Copies Sold!
Hello, this is WHO YOU (Fuyuki Hayashi). I’m sending out two announcements with this news. ▶ Update to Ver. 1.0.8 Fixed a bug where some images could not be exported in MyPicture Implemented a special effect for certain “Keyboards” that increases the number of follows gained by 50x Fixed segments where text overflowed in certain languages Fixed other minor bugs ▶ Game Surpasses 50,000 Copies! Yunyun Syndrome!? Rhythm Psychosis has sold more than 50,000 copies within five days of release. Thank you so much! This project began with just the two of us wanting to give form to what we "love." Thanks to the support of everyone involved and all of our fans, we are truly happy that it has become a “signal” reaching so many people. Starting with this update, and based on the valuable opinions and feedback we have received from everyone, we will continue making fixes and adjustments from every perspective including game design, systems, and localization, with the sole priority of making the game better. We are also taking various steps to revise the English text as a whole. However, this will take some time and we would greatly appreciate your patience on this. We will keep doing our best so that Yunyun Syndrome!? Rhythm Psychosis can be transmitted to even more people, and above all, so that it can make your kokoro more dokidoki through its signal. We would be very happy if you could continue helping us spread the signal of Yunyun Syndrome!? Rhythm Psychosis together! WHO YOURead full article on Community Announcements (STREAM)
