Tsubasa no Oreta Angel - S1.E1

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.