The focal point of the narrative is Minori, an orphan girl who suffers from an illness and is subjected to relentless bullying. On a wet day, Minori fails to show up at school as she was admitted to a hospital in a far-off place. Following two months, Takashi and Kyōko, the girl's classmates, receive an enigmatic email with no identifiable sender. The email discloses a nearby town's upcoming summer festival.