Rose Blood: Chi no Kawaki [J] Aaru 1996

This is a fairly standard adult visual novel with a bit of a detective story thrown in. In it your protagonist, Kei Nakabaru, is tasked with helping Reiko Matsui, his classmate, seek out and find a man who sexually assaulted her. Needless to say, that turns into quite the task that soon spirals into Kei coming face-to-face with madness and depravity.
Browser-Playable Version (@ The Asenheim Project)

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