In spring, a girl leaves the island of Hokkaido to attend university in Tokyo. Once there, she is asked to reveal why she wanted to go there in the first place.

A lonely young man (Haruma Miura) happens to meet RuoLan who has an identical twin sister RuMei. They are older than him. RuoLan tells him about her wound from a painful breakup and her troubles being a twin. While supporting RuoLan, the young man gets close to her.