"Oh, sorry!" Yamada bumps into Ichika, the mother of a friend who is staying over, while she is getting changed. Unable to forget the first time he sees a woman in her underwear, Yamada spends a sleepless night sneaking out of the room to clear his head, only to find Ichika asleep on the sofa. Her skirt is lifted up and he can see her bulging pussy lips. Unable to contain his excitement, Yamada takes advantage of Ichika's sleeping position...