A loser gets one chance to rewrite his worst choice, but time travel here has a cost and no safety net. Every decision sticks. Every punch matters because he can't reload, he can only go back 12 years, fix one thing, and watch the consequences ripple forward in ways he didn't expect. Takemichi's desperation to save Hinata is the only thing that makes him watchable, because the show knows he's a coward and a failure, and that's exactly why you keep going with him.

Takemichi Hanagaki is a hopeless part-timer stuck in a cramped apartment, mocked by a boss six years his junior, when he learns from the news that Hinata Tachibana, his only girlfriend back in middle school, has been killed by the Tokyo Manji Gang. When a crowd shoves him onto the train tracks, he suddenly leaps twelve years back to his middle school days. Takemichi discovers that his actions in the past can change the future. To save Hinata and turn around the life he spent running away, he sets out to climb to the top of the most sinister delinquent gang in Kanto. The show blends action, drama, romance and supernatural time travel.