Ever since her husband was hospitalized following an accident, Mizuki's sexual frustration has reached its limit. Then her husband's best friend, Tetsuro, comes to help with the heavy lifting in her husband's place. Mizuki is entranced by his manly, muscular body, and as soon as she sees him off, she becomes lost in lewd fantasies. The man is her husband's best friend. She knows she shouldn't be doing this, but her fingers won't stop and she's on the verge of climaxing when, suddenly, Tetsuro, who was supposed to have left, comes back...