My mother's best friend, Chisato, decided to stay over during the Obon holiday. - My mother's best friend is just an old woman. - Atsushi, who didn't have the slightest expectations, was instantly smitten by Chisato's beauty. - Every time I look at her sweaty neck or her boldly open chest, an obscene fantasy comes to mind. - Atsushi, who is really curious about Chisato, sneaks into the changing room to see her bathing, but unfortunately he runs into Chisato.