Delulu Denpa Rhythm Adventure “Yunyun Syndrome!? Rhythm Psychosis” Drops New Demo Today
Posted: Fri Oct 10, 2025 9:44 pm
DENPA SONGS × COPYPASTAS × RHYTHM GAME!
“YUNYUN SYNDROME!? RHYTHM PSYCHOSIS” (Steam)
LIMITED-TIME DEMO OUT NOW | JOINING STEAM NEXT FEST!
TOKYO – October 10, 2025 – Alliance Arts Inc. is excited to announce that a limited-time demo of Yunyun Syndrome!? Rhythm Psychosis is now available on Steam as of October 10, 2025. This rhythm adventure lets players groove to denpa songs while spreading chaotic copypastas across the Internet.
The demo will also be featured during Steam Next Fest, starting October 13. Don’t miss this chance to experience the “Yunyun-brain” for yourself!
Demo Page: https://store.steampowered.com/app/4074930/_Demo/
About the Demo
This special demo features roughly 30 minutes of gameplay from the early portion of Yunyun Syndrome!? Rhythm Psychosis, including both the rhythm and adventure segments of the full game loop.
While the story does not progress beyond the demo range, you can continue playing after completing the main section.
The full release will feature full Japanese voice acting for Qtie (VA: Nanahira) and Yunyun (VA: Haruko Momoi). Please note that some voice lines are not included in the demo version.
Players can also enjoy around 10 denpa songs, including hidden tracks, during the demo period. The limited-time demo will be available from October 10 through October 31, 2025.
Start your denpa descent today and feel the “Yunyun Syndrome” for yourself!
Demo Page: https://store.steampowered.com/app/4074930/_Demo/
About 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, a type of Japanese music that is intentionally strange and catchy.
A Multi-Ending Cute Psychological Horror
Qtie, the protagonist, is a hikikomori girl whose brain has gone a little (very) fuzzy from the pain of reality and an excess of 2D love. As she grooves to denpa songs, her “Yunyun-brained” posts begin to twist the world itself.
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 somewhere between delusion and denpa psychosis. Experience more than 30 denpa songs and multiple endings in this dizzying tale of obsession and ecstasy.
All Playable Songs Are “Denpa Songs”
Every track in Yunyun Syndrome!? Rhythm Psychosis is pure denpa. The lineup includes iconic songs such as “sakuranbokissu~bakuhatsudamo~n~,” “Miko Miko Nurse – Ai no Theme,” and “Kanbu de Tomatte sugu Tokeru Kyoki no Udongein.”
Characters
Qtie (VA: Nanahira): The main character. Real life hit her too hard, knocking a few screws in her head loose.
As a hikikomori she doesn’t leave the house, but instead spreads her love of Yunyun on social media. The denpa songs acts as a fuel for her to cook the copypastas.
Yunyun (VA: Haruko Momoi): The 2D character Qtie worships.
An angelic devil who speaks to Qtie through the computer screen—though whether Yunyun is real or only in Qtie’s imagination remains a mystery.
Copypastas with Yunyun-infused madness may soon engulf the whole world.
Add Yunyun Syndrome!? Rhythm Psychosis to your Steam Wishlist and stay tuned for more updates!
Steam: https://store.steampowered.com/app/2914150/
Product Information
TITLE: Yunyun Syndrome!? Rhythm Psychosis
GENRE: Rhythm Adventure
PLATFORM: PC (Steam)
STORE PAGE: https://store.steampowered.com/app/2914150/
PRICE: TBA
RELEASE DATE: This Winter
PLAYERS: Single-player
LANGUAGES: English, Japanese, Simplified/Traditional Chinese, Korean
DEVELOPERS: Alliance Arts, WHO YOU
PUBLISHER: Alliance Arts
About Alliance Arts Inc.
Alliance Arts believes fiction can empower us to face reality and make the world a richer place. We continue to challenge reality through the creative power of imagination.
Alliance Arts Inc. is a Tokyo-based publisher that believes fiction empowers people to face reality and enrich the world. The team challenges the boundaries between imagination and reality through original storytelling and game development. Learn more on their official site, follow them on X, and check out their work on YouTube.
“YUNYUN SYNDROME!? RHYTHM PSYCHOSIS” (Steam)
LIMITED-TIME DEMO OUT NOW | JOINING STEAM NEXT FEST!
TOKYO – October 10, 2025 – Alliance Arts Inc. is excited to announce that a limited-time demo of Yunyun Syndrome!? Rhythm Psychosis is now available on Steam as of October 10, 2025. This rhythm adventure lets players groove to denpa songs while spreading chaotic copypastas across the Internet.
The demo will also be featured during Steam Next Fest, starting October 13. Don’t miss this chance to experience the “Yunyun-brain” for yourself!
Demo Page: https://store.steampowered.com/app/4074930/_Demo/
About the Demo
This special demo features roughly 30 minutes of gameplay from the early portion of Yunyun Syndrome!? Rhythm Psychosis, including both the rhythm and adventure segments of the full game loop.
While the story does not progress beyond the demo range, you can continue playing after completing the main section.
The full release will feature full Japanese voice acting for Qtie (VA: Nanahira) and Yunyun (VA: Haruko Momoi). Please note that some voice lines are not included in the demo version.
Players can also enjoy around 10 denpa songs, including hidden tracks, during the demo period. The limited-time demo will be available from October 10 through October 31, 2025.
Start your denpa descent today and feel the “Yunyun Syndrome” for yourself!
Demo Page: https://store.steampowered.com/app/4074930/_Demo/
About 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, a type of Japanese music that is intentionally strange and catchy.
A Multi-Ending Cute Psychological Horror
Qtie, the protagonist, is a hikikomori girl whose brain has gone a little (very) fuzzy from the pain of reality and an excess of 2D love. As she grooves to denpa songs, her “Yunyun-brained” posts begin to twist the world itself.
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 somewhere between delusion and denpa psychosis. Experience more than 30 denpa songs and multiple endings in this dizzying tale of obsession and ecstasy.
All Playable Songs Are “Denpa Songs”
Every track in Yunyun Syndrome!? Rhythm Psychosis is pure denpa. The lineup includes iconic songs such as “sakuranbokissu~bakuhatsudamo~n~,” “Miko Miko Nurse – Ai no Theme,” and “Kanbu de Tomatte sugu Tokeru Kyoki no Udongein.”
Characters
Qtie (VA: Nanahira): The main character. Real life hit her too hard, knocking a few screws in her head loose.
As a hikikomori she doesn’t leave the house, but instead spreads her love of Yunyun on social media. The denpa songs acts as a fuel for her to cook the copypastas.
Yunyun (VA: Haruko Momoi): The 2D character Qtie worships.
An angelic devil who speaks to Qtie through the computer screen—though whether Yunyun is real or only in Qtie’s imagination remains a mystery.
Copypastas with Yunyun-infused madness may soon engulf the whole world.
Add Yunyun Syndrome!? Rhythm Psychosis to your Steam Wishlist and stay tuned for more updates!
Steam: https://store.steampowered.com/app/2914150/
Product Information
TITLE: Yunyun Syndrome!? Rhythm Psychosis
GENRE: Rhythm Adventure
PLATFORM: PC (Steam)
STORE PAGE: https://store.steampowered.com/app/2914150/
PRICE: TBA
RELEASE DATE: This Winter
PLAYERS: Single-player
LANGUAGES: English, Japanese, Simplified/Traditional Chinese, Korean
DEVELOPERS: Alliance Arts, WHO YOU
PUBLISHER: Alliance Arts
About Alliance Arts Inc.
Alliance Arts believes fiction can empower us to face reality and make the world a richer place. We continue to challenge reality through the creative power of imagination.
Alliance Arts Inc. is a Tokyo-based publisher that believes fiction empowers people to face reality and enrich the world. The team challenges the boundaries between imagination and reality through original storytelling and game development. Learn more on their official site, follow them on X, and check out their work on YouTube.