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Check out the latest Kumitantei: Old School Slaughter trailer for a peek at what's coming in Episode 2 of the murder-mystery ADV. Episode 2: Gloomy Shojo Sunday of Kumitantei: Old School Slaughter will be available in November 2026 on PC.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.