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Kumitantei: Old-School Slaughter
Mango Factory·2026·
Kill each other...for science! The class of '89 is trapped in an elite school killing game. Investigate, solve, and expose your classmates in Kumitantei: Old-School Slaughter, an episodic murder-mystery ADV card-battler inspired by retro anime.
Himari Sanada is an ordinary girl who's had the greatest Imperial honor for students thrust upon her: an Absolute title and admission to the prestigious military research academy Janus Institute. The morning of her first day however, she does not wake up in her bedroom, instead finding herself trapped alongside 15 other Absolute students within a decaying old bunker seemingly built by their new school. Confronted by a strange two-faced cat, the class learns they've been brought here as test subjects in a kill-or-be-killed Apathy Experiment designed to fracture and drain their very humanity. H...
Also known as: Kumitantei: Shouwa no Satsuriku mu Kandou Gakuen, Kumitantei.exe
April 23, 2026
Kumitantei: Old-School Slaughter was released on April 23, 2026.
Kumitantei: Old-School Slaughter is available on PC (Microsoft Windows).
No — Kumitantei: Old-School Slaughter is a single-player game.
Kumitantei: Old-School Slaughter was developed by Mango Factory and published by Akupara Games.