Karada Iokawa, who is about to start junior high school, is a happy and dependable young lady who despises being treated like a child above all else. Hiro, her older brother, returns from studying abroad to look after her after her parents pass away. Shouko Nogami, his ex-girlfriend, is a collected but occasionally petulant and headstrong young woman who follows him to Japan to find out why he left her. The atmosphere between the two females is hostile, which drives Shouko to refer to Karada as a child. Karada afterwards prays to grow up in front of a shrine. She has no idea that the shrine wishing stone will fulfill her request. At the same time as Karada grows older, Shouko, who happens to be nearby, discovers herself pregnant.