Hanagaki Takemichi, once a delinquent who fled his troubled past, finds himself thrust back in time to his middle school days after a chance encounter on a train platform. With the gang he once feared now a formidable force in Tokyo's underworld, Takemichi discovers they are responsible for the tragic death of his former girlfriend. Determined to alter the course of events, he seizes the opportunity to correct past mistakes. As he navigates the complexities of rewriting history, Takemichi grapples with the possibility of changing not just his girlfriend's fate, but the future itself.