TOKYO — Nov. 29, 2025 — Yunyun Syndrome!? Rhythm Psychosis, the psychological rhythm adventure co-developed by Alliance Arts and WHO YOU, brings internet brain rot to a new rhythmic reality in April 2026 on PC via Steam alongside a demo update today, as revealed during INDIE Live Expo.
In the updated demo, compete for the title of Yunyun’s #1 fan with the addition of online rankings. Check out the new trailer here, and kickstart the musical insanity with Yunyun’s new theme song “Peak Ecstasy!! Rim de Lacent☆” by singer-songwriter Haruko Momoi.
Ever heard of Yunyun, the angelic internet sensation? No? How!? Avid anonymous poster (and possibly psychotic shut-in) Qtie aims to change that by spreading Yunyun love on social media until the entire planet matches her obsession. Spread degenerate copypasta across the web by tapping out love notes on her keyboard to the tunes of 30+ intense denpa tracks.
One itty bitty, kind of important detail…Yunyun might not exist. While Qtie’s feelings are real, the winged wonder may be a figment of her imagination. Navigate music-induced fantasies as she attempts to win the affections of her soon-to-be sweetheart. Somehow, this parasocial situationship may lead to the destruction of the world. Oh well, all is fair in love and war, and if Qtie can’t secure Yunyun’s affections… no one can.
Yunyun Syndrome!? Rhythm Psychosis corrupts the whole world on PC via Steam with an updated demo. Look forward to the new denpa world order when the full game launches in April 2026, with English, Russian, Brazilian Portuguese, French, German, and Polish language support.
For more information, wishlist Yunyun Syndrome!? Rhythm Psychosis on Steam, and join the official Discord.
About Alliance Arts Inc.
Alliance Arts is a new Tokyo-based publishing company committed to the creation of captivating games, and behind titles including The Great Villainess: Strategy of Lily, Touhou Dungeon Maker: The labyrinth of heart, and Marisa of Liartop Mountain.
