On the first anniversary of their relationship, Hiroshi visits his girlfriend's home and is instantly captivated by the stunning beauty and voluptuous figure of her mother. That night, graciously allowed to stay over, he uses the bathroom and finds himself being washed by the mother's own hands—her touch on his groin unexpectedly stirring intense arousal and itching desire. Unable to sleep as the night deepens, he leaves his room and discovers her peacefully asleep in her bedroom, her serene presence once again shaking Hiroshi's heart. A soft part of her body catches his eye, and an uncontrollable impulse drives him forward...!