A children’s novel that begins when a timid first-year high school boy meets “Sato-san,” a girl possessed by a ghost, and agrees to help exorcise her. Through the supernatural premise, it follows an unusual relationship and a process of growth.

Meeting the ghost-haunted Sato-san gradually changes the boy’s ordinary life.

A children’s literature work selected for a commendation in the Kodansha Children’s Literature Newcomer Award. Centered on the accumulation of days suggested by its title, it can be read as a story attentive to the sense of time felt by young readers.

It portrays small changes of feeling across ordinary days, close to the perspective of young readers.