After divorcing, a mother raised her son alone. Eventually, he grew into a fine young man and secured a job. Seizing the opportunity, she planned a hot spring trip with her son during his vacation. Proud of her youthful and beautiful appearance, she remained unaware of her son's gradually twisted feelings. One day, he suddenly confessed, "I love you, Mother..." Surprised and confused, she could no longer resist and gave in to him. As they drew closer, both began to feel undeniable pleasure. The mother, too, started recognizing her own emotions. Their time together in the Shozu inn brought a new change to their parent-child relationship. A strange intimacy blossomed between the mother and son as they desired one another.