Oozone Satoshi

Rookie police officer Shinta Sato is driven by a strong sense of justice. When he throws himself in front of a speeding van to stop it from plowing into a group of children, he wakes up to find himself thirteen years in the past, back in his high school days. But there’s a cruel twist. The day he’s returned to is the very day his best friend took his own life. Unable to change what happened, Sato is once again forced to hear the devastating news of his friend’s death. Back then, overwhelmed by grief, he never even attended the funeral. This time, however, he goes to pay his respects, only to uncover the shocking truth that his friend had been the victim of bullying. “Why was I sent back thirteen years?” Clutching the service pistol that somehow traveled through time with him, a new resolve begins to take shape within Sato…!!

An abused kid and his mom decide to skip town one night in order to escape the loan sharks hounding them over the father's debt. After his mother dies, the boy decides to exact revenge on the people who were responsible.