Aiko Morimura is a junior‑high student who is shorter than her peers. Ten years ago, her father vanished aboard a yacht and his whereabouts remain unknown. After her mother, a hat designer, left for Paris, Aiko was raised by her uncle, Mr. Fujinami. She once owned a dog named Papi, who died in a car accident. Shortly thereafter, a new dog named Spank appears in her life. Amid the series of misfortunes she has endured, Spank’s arrival brings new hope and a smile to Aiko’s face.