Anime Movie - Seisai 1

On the campus of Nankai Academy, a heinous murder was committed. Professor Yuko, one of the most well-liked instructors at the school, died after being pushed from the roof of one of the school's buildings. Her death has left her students in a state of bewilderment, anguish, and, above all, rage. Masayoshi, Daisuke, Mitsuru, and Shinya, four of her male students, are desperate to find out the truth. They soon discover a significant clue: Professor Yuko's planner had been marked with the names of seven girls on the night she was murdered. The boys begin their investigations with this proof... and they'll use any way necessary to find the murderer. They unearth key facts through rape, deception, and torture, but fitting the piece together will be difficult. And the longer they explore, the more they realize they're being consumed by their own dark cravings... Will the truth behind Yuko's death ever be revealed?