or the "R18+" adult content restoration patch. On some platforms like DLsite, the English version is sold as a separate product or an add-on to the original Japanese base game. Steam Version

Sirius shook her head. “I could have. But this wasn’t a test I wanted to win.” She handed the primed core to the courier. “You’re going to bury it in an inert vault. No buyers, no threats. If they fight, you destroy the signatures.”

Players explore the school grounds to gather clues and identify suspects among a diverse cast of characters.