The series features a cast predominantly composed of students and faculty at the elite academy:

One of the father's legitimate daughters and a primary target of the Protagonist.

The catalyst for the plot occurs when a mysterious woman grants the Protagonist a magical watch capable of . Fueled by the death of his mother in poverty, he uses this device to infiltrate the academy and enact a sadistic revenge plan. His primary targets are his two half-sisters, Kanako and Hina Tachibana , though his ultimate goal is to completely dismantle his father's reputation and legacy by victimizing the entire student body. Key Characters

Kanako's sister, who also falls victim to the Protagonist's schemes.

The enigmatic figure who provides the Protagonist with the time-stopping watch.