Asatte no Houkou

A young girl named Karada Iokawa is about to start junior high school after summer ends. Shōko Nogami, a young woman who recently returned from studying abroad, is the former girlfriend of Karada's older brother, Hiro. On the day Shōko returns, Karada takes her to the beach with her brother and friends. Shōko, annoyed by Hiro's past behavior, tells Karada her ribbons are childish, upsetting her. Later, Shōko finds Karada at a shrine, praying to become older. Karada's wish is granted, transforming her into a young woman. At the same time, Shōko is transformed into an eleven-year-old.