Toma lives in a small riverside town with his brutish father and his father's girlfriend. Witnessing his father's predilections for abuse, Toma becomes anxious that he will have inherited those urges.
This work is a 12-year story of Mana, a woman who cannot accept the death of her best friend, staring at her as she tries to step forward while having deep sorrow.
A young bioarchaeologist Yukisuke is attracted to a girl Koyomi, who runs a small stand of taiyaki pastry that he often buys. Koyomi is hospitalized, however, by a car accident on a rainy day after they go out together, and wakes up with short term memory loss, where she cannot remember anything beyond the present day. Yukisuke tries to live close to her as before but the lack of collective memory starts to stagger him.
