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Hanagaki Takemichi is a 26-year-old loser: a part-time clerk, perpetually single, and utterly resigned to her meaningless life. When she sees the news of her first love's brother being murdered by the infamous Tokyo Manji Gang, she is killed in a train accident, consumed by regret.
She wakes up as her 15-year-old self, twelve years in the past.
This is her chance. Armed with foreknowledge, her only goal is to save Naoto Tachibana and ensure a happy future for him-and her first love-Hinata. But to change fate, she must dive headfirst into the brutal, all-male gang wars of Tokyo's delinquent underworld.