Kawasaki, who was visiting his friend Atsushi's house, accidentally witnesses Atsushi's mother, Miyu, changing clothes. (Even though she's beautiful, she wears such big panties...) Kawasaki was excited to see the underwear of an adult woman other than his mother for the first time in his life, and from then on he often stole underwear to take home, but later he was found out by Miyu. Kawasaki then came to his senses and confessed that he was still a virgin, and begged Miyu to take Miyu.