​Join Masayoshi, Daisuke, Mitsuru, and Shinya as they embark on a dark and thrilling journey to uncover the truth behind the murder of their beloved teacher, Professor Yuko, in Nankai Academy. Determined to find justice, the four male students stumble upon a chilling clue: a marked planner containing the names of seven girls, all linked to the night of the fatal incident. Using any means necessary, including rape, manipulation, and torture, they delve into a world of darkness where their own desires threaten to consume them. Will these troubled young men be able to piece together the puzzle and finally reveal the shocking secrets behind Yuko’s death? Get ready for a harrowing tale of lust, revenge, and betrayal that will leave you breathless.​