Kawasaki, who was visiting his friend Atsushi's house, accidentally witnesses Atsushi's mother, Miyu, changing her clothes. (I can't believe an auntie who's so beautiful is wearing such big underwear...) Kawasaki, who felt excitement seeing the raw underwear of an adult woman other than his mother for the first time in his life, started stealing underwear and taking it home frequently from then on, but that was discovered by Miyu later. Then, Kawasaki, having given up, confesses that he is still a virgin and begs Miyu to break him in.