Misaki Nakano

Ren Takahashi and Aoi Sonoda were both born in 1989. They met for the first time at the age of 13 and became each other's first love, but they separated. At the age of 21, they met again. They were unable to undo their past. Now, they are 31 years old.

Single father Kenichi has raised his daughter Miki alone for the past ten years, from when she attended nursery school until her graduation from elementary school. Kenichi is currently 30 years old. His wife Tomoko died at a young age and he has raised Miki alone since that time. While raising his daughter alone, he has encountered various problems.