Aunt Ai, who returned from the United States, suddenly came to her nephew Toshiya's apartment in Tokyo and decided to stay for three days. Toshiya was fascinated by Ai's kind smile and her voluptuous body, and his head was filled with dirty fantasies! Then, one night, something happened! Ai, who had been drinking and taking a bath, got hot in the bathroom. Toshiya put the half-conscious Ai to bed and, unable to resist, started to play with her body...