After graduating from a university in Tokyo, Yusuke decided to stay in the city for work. To honor his parents, he took a three-day, two-night hot spring trip with them. Having subconsciously viewed his mother Yurie as a woman since childhood, Yusuke could no longer suppress his emotions. Avoiding his father's gaze, he forcefully entered a sexual relationship with her. Torn between fulfillment and guilt, his heart wavers. Though he knows what he's doing is wrong, his mind and body betray him, plunging him into confusion and turmoil. This is a story of adult desire and moral conflict, portraying inner struggles and emotional instability.