Kento, a freeter, was dating Kanami, a busty college student at his part-time job. One day, Kanami invites him out for dinner. Kento gets excited after Kanami says he can stay over. Kanami lives with her mother. Kanami's mother, Touko, has even bustier breasts than Kanami and looks younger than her actual age. That night, Kento treat Kanami's body as a thank you for the dinner. Kanami refuses, worried about her mother sleeping next to her but she gradually gets into it. The two of them passionately desire each other. Their moans reach the next room. Touko is excited by the heat of the two young people. Touko desperately tries to comfort herself, but it is not enough. The next day, Kanami leaves the house early for her part-time job. Touko offers Kento who remained in the house a cup of tea. Even though he has just woken up, Kento is overcome by sleepiness for some reason. When he wakes up, the scene before his eyes is... (͠≖ ͜ʖ͠≖)