As beautiful sisters, their mothers were famous in the neighborhood, but they were worried about the education of their sons. Despite being well into their teens, their shy, virgin sons hadn't even held hands with a girl, let alone had a girlfriend. As expected, even as the enjoyable summer vacation began, they spent all their time in their rooms, binge-watching anime and surfing the internet... Worried about their future, the two mothers decided to initiate a radical sex education to spark their interest and concern for women...