Masahiro Uchiyama

Kazuto Ishikawa is a first-class architect. He is married to Kiyomi. They have a son, Tadashi, who attends high school and a daughter, Miyabi, who attends middle school. They live together in a refined home, designed by Kazuto. An injury causes Tadashi to quit playing soccer. Since that time, Tadashi often stays out all night without permission. One evening, Tadashi leaves home and does not return. Kazuto and Kiyomi become worried about their son and consider going to the police. News then reveals the murder of Tadashi's classmate. The police suspect that Tadashi might be involved in the murder.

Ryoichi Yoshimori is a university student. His girlfriend, Kyoko Sawada is a few years older but the pair don’t care as they are deeply in love. After Ryoichi proposes to Kyoko, she suddenly disappears. Several days later, Kyoko re-emerges but claims to have no memory of him. With the help of a classmate/lawyer Chiaki Takaharu and his childhood friend Maki Kawai, Ryoichi attempts to unravel the mystery that may be related to the rumours of a memory erasing individual known as Kiokuya.

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.