Setsuna’s beloved younger sister has taken her own life. The cause: brutal bullying carried out by seven members of the student council. Swearing revenge, Setsuna begins executing a plan to kill them one by one. However, no matter how many times he kills them, time rewinds to a point where they are still alive. Trapped in a time loop, his revenge seems impossible to achieve. But then, Setsuna realizes a single possibility—what if the revenge is carried out by a third party he manipulates? Will the time loop still reset? Using cunning and strategy, he sets out to orchestrate the perfect crime through manipulation. A time-loop revenge thriller begins!