Mizuhō Aoi (18), who attends a prefectural school in Kanagawa Prefecture, is dating Shō, a classmate from another class. Both are each other's first boyfriend and girlfriend. At school, Mizuhō is not the type of student who stands out, and she doesn't have many friends. After two months of dating, Shō and Mizuhō have sex for the first time at Shō's house.
