I went back to being a middle school student, changed the past where the school's most beautiful girl was going to commit suicide, and when I returned to the future, I was married to her.

Itsuki Irie, a loser freelancer virgin in life, was burdened with debt and living a life shuttling between a shabby apartment and convenience stores. Days of hellish work to repay his debt. One day, he nearly gets hit by a truck. In that moment, Itsuki Irie recalls his only regret in life. It was about a girl named Kotori Shiina whom he confessed to for the first time in middle school and was cruelly rejected by. When he wakes up, he has time-leaped back to his middle school days. Before the time-leaped Itsuki Irie stands Kotori Shiina, the most beautiful girl in school. Just as before, Itsuki Irie is rejected by Kotori Shiina. Itsuki Irie remembers. Because of this confession, she begins to be bullied and ends up committing suicide. Itsuki Irie sets out to change the future where Kotori Shiina commits suicide.