One day, fifth grader Hinata Hoshino brings her friend Hana Shirosaki to her house, and Hinata's sister Miyako, a college student, falls in love with with Hana at first sight. Miyako manages to get along with Hana somehow, but her clumsy behavior and shyness, makes Hana wary. Even so, Hana gradually opens up to Miyako, who wants to become closer to her.