Mio is 20 years old. Having lost her parents early, she and her grandmother run a traditional inn in Nagano. However, her grandmother gets sick. Mio moves to Tokyo and lives with her father’s best friend, Kyosuke. He runs a public bath. She begins to work at the public bath, but it is scheduled to be demolished to make way for redevelopment.
27-year-old Hatsumi Takimoto is a former teacher and now waitress. She holds a secret. Three years after her boyfriend died, she receives a letter from him. After meeting a former student, Hatsumi Takimoto confesses about her past.
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.
