This summer, Yusuke decided to return to his hometown after a long time. His two brothers and two sisters-in-law also returned this time. Both of their wives had big breasts and the same interests, even their names were similar, Nonoura. They freely exposed their sensitive parts in front of Yusuke, sometimes because of sweat, sometimes because they had just finished bathing. Because he didn't have a girlfriend yet, Yusuke couldn't resist the charm of his two sisters and then at night he snuck into Nonoura's bedroom, but Yuri knew that too...