Ken-ta, a college dropout, is staying at his uncle's place in Tokyo to attend a summer cram school. His uncle and aunt, married just last year, are trying to conceive, but the uncle's advanced age seems to have weakened his sperm, making it difficult for them to have a child. Shortly after Ken-ta arrives in Tokyo, his uncle goes on a week-long business trip. The moment he leaves, his aunt, clad in revealing attire, starts seducing Ken-ta with her voluptuous backside, targeting his love for big butts with provocative backstep thrusts. Ken-ta's rationality crumbles under her intense allure...
