(from ebookjapan):

Keiko goes to Mount Osorezan, where the spirits of the dead gather, to meet Kuramoto, the man who ruined her life and died. Keiko becomes doubtful about the existence of "itako" or itako who summons spirits and draws them to her, and decides to go back home.

On the bus on her way home, she meets a man traveling alone, and they decide to go together. However, when Keiko sees a man who looks exactly like Kuramoto at Aomori station, she unintentionally chases after him and...?