"Hey, why don't you just try hard and hold back from having sex? If you do that, your sperm will get thicker and you might have a baby," Toshio and Aya are a couple who are not very blessed with childbirth. At Aya's suggestion, she ended up living a life of abstinence for a month. However, Toshio, who was not only allowed to have sex but also masturbated, gets horny and gets a hard erect after a week. "Can I hold it on?" Toshio was worried, but what he really needed to worry was the presence of Aya's mother, Yumi, whom he lives with.