During his childhood, the protagonist home stayed with a certain family in the USA. There, he met a girl around his age whom he quickly became friends with. Several years later, he was informed by his parents, who are in the USA, that the girl he used to be friends with will be coming to Japan as a foreign student, and she will be homestay at his house. "It's been ages!" And so, cohabiting life with the aggressive foreign student, blond hair childhood friend begins.