Fifty-year-old housekeeper Tsubaki Aikawa falls into a trap set by the lustful brothers who hired her, and her body is soon violated at their mercy. Submitting to their desires, she is driven toward a fate of complete physical domination. Drawn into the brothers' sexual servitude, Tsubaki gradually loses all sense of self. No longer just a housekeeper, she descends further into becoming a mere sex slave for the brothers' pleasure. The story captures her conflicting sensations of pleasure and fear, as her innocent mind slowly erodes away.