Shuuji’s grades have taken a hit since he played around too much, so his cousin Tsubame decides to take him in to keep an eye on him. But since she’s usually busy with work, he ends up taking care of the house along with younger cousin Aoi. He wishes to become independent soon. At this time, he helped his classmate Itsuki and became pretend lovers with her. Then his imouto Konomi came to see him, along with the daughter of his judo teacher and his osananajimi, Amane. What future awaits him?