Aiko resides in a shrine featuring a sliding door that is mysteriously only half-painted; during her childhood, she thought she wanted to paint it. However, the 17-year-old Aiko now has no dreams about the future. Suddenly, a strange man appears before her. Aiko's grandfather, who is the shrine's chief priest, offers the man a place to stay in the shrine, but Aiko refuses to accept this. Yet, she realizes the kindness of the brusque young man and slowly comes to like him. What is his true identity?