When Rei, a shoujo otaku with her head in the clouds, finds a flower on her desk after school one day, she's on cloud nine. That night, after thinking it over, she decides to contact one of three boys she thinks it could be:
- Haruka Kaiba, her childhood friend with a heart of gold who puts up with all her antics,
- Masatora Tatebayashi, an aloof delinquent that Rei suspects has a softer side, and
- Souichi Mouri , a gloomy kid, but also Rei's neighbor in class.
She makes the call, creating a connection between her and the boy that sheds flowers. As she nurtures her bond with them, though, she begins to discover their vulnerable parts, and in turn, has to confront her own.