In central Tokyo, a young man, Sosuke, aspires to be a manga artist. His current work is about a battle between a hunter and a Japanese wolf. He can’t draw the extinct wolf well and struggles to develop the story. One winter’s day, Sosuke finds an animal’s skull while digging foundations at a construction site and takes it home. Is it a Japanese wolf’s skull?

Struggling manga author Satoru Fujinuma is beset by his fear to express himself. However, he has a supernatural ability of being forced to prevent deaths and catastrophes by being sent back in time before the incident occurred, repeating time until the accident is prevented. One day, he gets involved in an accident that has him framed as a murderer. Desperate to save the victim, he sends himself back in time only to find himself as a grade-schooler one month before fellow classmate Kayo Hinazuki went missing. Satoru now embarks on a new quest: to save Kayo and solve the mystery behind her disappearance.