Seisai ~Hakudaku no Misogi~

A horrific murder rocks Nankai Academy: Professor Yuko, a beloved teacher, is pushed off a rooftop. Her death leaves her students reeling with confusion, grief, and rage. Four male students—Masayoshi, Daisuke, Mitsuru, and Shinya—are determined to uncover the truth. They find a crucial clue: Yuko's planner was marked on the night she died with the names of seven girls. Armed with this evidence, the boys launch an investigation, using rape, manipulation, and torture to extract information. But as they piece together the puzzle, their own dark desires begin to consume them...