Momo, a young girl, moves to a remote Japanese island with her mother after her father's death. She finds her new home and meets local children, but strange occurrences start happening, including ransacked orchards and disappearing trinkets. Momo discovers that her mother doesn't believe her, so she decides to investigate the strange happenings, leading her to a trio of mischievous imps: Kawa, Mame, and Iwa.

A Letter to Momo
An 11-year-old girl named Momo faces a significant turning point in her life after her father's death, relocating to a small island town with her mother.