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Yunyun Syndrome!? Rhythm Psychosis
“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.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-25.
“Fun rhythm game, great art style, terrible translation. Even if you don't understand a word of japanese, you can tell they're just making things up with the Zoomer slang. Luckily there's a few fan translations already so I'd recommend patching it.”
— a player, Steam review · 2 hrs played“Who is Yunyun? For the lost, she is the vision. For the hungry, she is the chef. For the thirsty, she is water. If Yunyun thinks, I agree. If Yunyun SENDS, I RECEIVE. If Yunyun has a milion fans, I am one of them. If Yunyun has ten fans, I am one of them. If Yunyun has only one…”
— a player, Steam review · 8 hrs played“Who is Yunyun? For the lost, she is the vision. For the hungry, she is the chef. For the thirsty, she is the water. If Yunyun thinks, I agree! Rim De Lacent!”
— a player, Steam review · 3 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-08 via SteamCharts.
Achievement stats
Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-26.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-09-26. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
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
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! [img src="
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 rati
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 becom
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
Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-09-25.
| Genres | Adventure, Indie, Simulation |
| Player tags | Rhythm · Psychological Horror · Anime · Cute · Music · Visual Novel · Multiple Endings · Adventure · Female Protagonist · Simulation · Singleplayer · Psychological (Steam store community voting) |
| Features | Single-player · Steam Achievements · Steam Cloud · Steam Leaderboards · Family Sharing |
| Languages | English, Simplified Chinese, Japanese * , Traditional Chinese, Korean, French, German, Portuguese - Brazil, Polish, Russian, Italian, Spanish - Spain, Spanish - Latin America, Thai, Turkish * |
| Achievements | 49 |
Minimum system requirements (PC)
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