The girl who looks like Mio in the courtyard soon disappears in a flash. Mio remains absent from school for a few days, and Riki's friends slowly start forgetting about her. As Riki finds Mio in the courtyard one day, she lends him her treasured poetry collection and invites him to accompany her to the beach. Midori, the girl who looks like Mio, shows up at the beach and exposes the fact that Mio has no shadow, the reason why she always carries a parasol. Upon learning this, Riki collapses from an attack of narcolepsy, but he wakes up back in his dorm room with no recollection from what happened at the beach. As Riki ponders what is missing in the course of life, he rediscovers Mio's poetry collection and rushes to the classroom in search for Mio. However, as Midori arrives, only Riki knows that she is not Mio. While Riki mulls over Mio's disappearance, Midori confronts Riki, but he refuses to address her as Mio like everyone else. Although Riki thinks that Midori may be Mio's forgotten shadow, Midori points out that she does not have a shadow either. Midori states that Riki will forget Mio before long.