While living with his sister-in-law, a younger brother is invited to dinner by his senior at work during his older brother's business trip. The sister-in-law warmly treats them to a home-cooked meal, and they enjoy a pleasant evening together—until she gets drunk and starts acting out. Trying to calm her down, the younger brother is suddenly overpowered: she pins him down, kisses him, teases him relentlessly, torments him persistently, treats him like an aggressive seductress, and ultimately forces him to climax. Troubled by his sister-in-law's drunken behavior, he blames himself during his brother's absence, feels guilt over his senior's compliments, and carries the frustration of being unable to stop her—along with a resigned acceptance toward the uninhibited woman she becomes once her switch is flipped.