A minor marital dispute escalates into a major fight. When his wife storms out in anger, his sister-in-law Ruisa offers to mediate. Yuta becomes flustered by the situation and gradually finds himself drawn to Ruisa's kindness. Ruisa is beautiful, with an ideal figure and graceful, sensual curves. Yuta feels his emotions wavering under her allure—until unexpectedly, she walks in on him in the bath. That fleeting moment sparks a new wave of desire within him.