The lucky younger brother gets to live with two lustful sisters craving for sex. This summer, Yusuke decided to return to his hometown after a long time. His two older brothers and two older sisters also attended the ceremony. Their husbands all have big chests and love each other, even though their names are similar: Yuuri and Yuuri. They can reveal their private parts to Yusuke, sometimes from sweating, sometimes after showering. Without a girlfriend, Yusuke can’t resist the allure of his two sisters and sneaks into Yuri's bedroom at night, but even Yusuke knows it.