Tatsuya, his son, has been depressed every day since breaking up with his girlfriend. Unable to bear seeing him like this, his mother Hana wants to somehow encourage and comfort him. However, this is a first for Hana, and she doesn't know what to say to him. Then Tatsuya blurts out the unexpected reason for his breakup. "The truth is, I have premature ejaculation, so I can't do it properly in sex. There's nothing I can do about it." Hana is surprised for a moment by his unexpected sexual problem, but then... "Oh, is that so? Then I'll give you some special training." Hana has come up with a way to improve her son's premature ejaculation, and to start with, she lets him touch her voluptuous breasts...