Misaki Okuna falls into the trap of her part-time job manager, becoming seduced by the mistress's penis and driving her prematurely ejaculating husband to despair. (SAN-120)

Misaki, married for three years, has been suffering from her husband's premature ejaculation. One day, she receives a strange package containing adult toys. Knowing it's wrong, she uses them for masturbation. Misaki is then targeted by a suspicious person... One day, her part-time shop manager delivers an item she forgot to take. Misaki offers him tea as a thank you. The manager, who has always wanted Misaki, takes this opportunity to slip an aphrodisiac into her tea. Becoming intensely aroused by the drug, Misaki completely loses her senses and has sex with the manager. Misaki is filmed and blackmailed... but gradually becomes addicted to the constant ejaculation of the manager's semen. Misaki's unusual behavior arouses her husband's suspicion. After he sets up a camera, he discovers the affair and ultimately...