Meet Satoru Fujinuma, a 29-year-old who makes ends meet by delivering pizzas part-time. Although his career as a mangaka didn't take off, he possesses an extraordinary ability called "Revival." This exceptional power lets him travel back in time, just before a life-threatening incident occurs, giving him a chance to rescue those in danger.
When a loved one is killed, and he is falsely accused of the crime, Satoru's life takes a dark turn. To clear his name, he seeks refuge elsewhere and suddenly finds himself transported back 18 years to his elementary school days. He re-lives a haunting incident that has been haunting him since he was younger, the disappearance, and murder of his classmate, Kayo Hinazuki.
Determined to fix things, Satoru must use his cunning to prevent Kayo's premature death and uncover the culprit's identity. But how is this tragedy related to his current predicament? Can Satoru alter fate's trajectory?