Aya married a man with a stepchild. She was already on good terms with her adult stepchild, Yuya, and was spending fulfilling days. However, in reality, she began to feel lonely in her unfulfilled life because her sexual encounters with her bland husband were not enough... At that time, her husband's long-term business trip was decided, and living with Yuya began unexpectedly. Then, she began to feel a strange closeness to him, and as she felt a growing sense of unease with his increased physical contact, Aya tried to distance herself, but Yuya began to approach her more and more boldly...