​”Nankai Academy is shaken by a heinous crime when Professor Yuko is brutally murdered. Left bewildered, pained, and consumed by rage, her students embark on a mission to uncover the truth. Driven by a vital clue in Professor Yuko’s planner—containing the names of seven girls marked on the night of her death—the four male students, Masayoshi, Daisuke, Mitsuru, and Shinya, spare no means to solve the mystery. Their investigation takes them down a dark path involving rape, manipulation, and torture, slowly succumbing to their own twisted desires. As they struggle to piece together the grim puzzle, their pursuit becomes more intense, raising the question: will they ever discover what lies behind Yuko’s tragic demise?”​