Dakara, Anata wa o Shimai desu

Hakua Kamishiro is a model student serving as the Student Council President. His life is shattered when a group of jealous classmates orchestrates a "crime" that leaves his younger sister unconscious after a hit-and-run, followed shortly by the tragic suicide of his mother.

Crushed by a sense of loss and utter helplessness, Hakua finds an unexpected ally in his junior from the student council, Maria Yagi. She offers a chilling solution: "We are going to make everyone who made you suffer take their own lives." With Maria’s help, Hakua resolves to exact his revenge on the three people who destroyed his family.