Kawasaki, who came to visit his friend Atsushi's house, happened to witness Atsushi's mother, Miyu, changing clothes. (My aunt is beautiful, but she's wearing such big pants...) For the first time in his life, Kawasaki was excited to see an adult woman other than his mother in her raw underwear, and since then, she often steals her underwear and goes home, but she is later found out by Miyu. Then, Kawasaki, who has reopened, confesses that he is still a virgin and begs Miyu to put down the brush.