Mitsuhiko 46 years old salaryman who had just been laid off and was told that his wife wanted a divorce, something that he might have been wanting for years visits a soapland brothel. While there slips and hits his head losing consciousness is transported back to his 16 year old body but has retained his memories. Now 16 years old and in high school he meets his first love and classmate Satsuki and his future wife Sachiko. Mitsuhiko believes this is all a dream until he starts realizing that this is no dream. Mitsuhiko decides to start over again anew.

Mitsuhiko (46) now in his 16 year old body flees with Satsuki after being beaten by a couple of delinquents. After parting ways with Satsuki, he makes his way home where he meets his mother, sister and younger brother feeling very nostalgic he starts reminiscing about his current life happy to eat with his family he is reminded of his sad and lonely future. Baba a classmate of his approaches Mitsuhiko wanting to know more about the defeat of the delinquents. Worried about Satsuki's reaction who the one that defended against the delinquents calls calls her up to the roof.

Mitsuhiko who has been attempted to avoid his future wife Sachiko is stopped by her friend Maruo and is questioned if likes Sachiko. Mitsuhiko remembers how his life turned out accidentally voicing his feelings while remembering. After school the delinquents are at the front gate ambushing students passing by. Mitsuhiko attempts to convince Satsuki. He musters up courage and confronts the delinquents.

Mitsuhiko was threaten to bring 100,000 yen, with nobody to turn to he consulted with his sister, Yasuko. Yasuko called her boyfriend Shimotsuma to see if he is able to help. Shimotsuma is a much older man dressed in nice clothing and has an energetic attitude. As they made their way to the meeting spot one of the delinquents threw a glass cup that hit Shimotsuma's forehead.

Mitsuhiko was helped by his sister's boyfriend. The next day Mitsuhiko goes to school and finds that Satsuki is absent. He attempts to find work to pay back the money he had borrowed when he was stopped by a signage that were looking for part time workers. He looks inside to find Satsuki working realizing why she was absent.