Mayuri-sama no Jintai Jikkenshitsu (Mayuri-sama's Human Laboratory) is an adult-oriented fan-made series based on the franchise, developed by the circle Circle Eden
She laughed again—that same strange, hollow laugh from Hour 48. Then she clicked Accept.
Given the title, here are a few points that might help:
: It is categorized as an adult-oriented "Action" or "Hentai" game.