While her husband is away on a long business trip, Asahi lives alone with her son. She recently met her son's classmate, Koume, and Kokoro with her complicated family situation. She slowly begins to open up to her... Koume, who is attracted to Asahi's voluptuous body, takes advantage of Asahi's defenselessness and ends up having a relationship with her. Asahi feels guilty, but loses herself in the pleasure of her private parts that she hasn't touched in a long time, and she can't help but give herself over to his persistent caresses. After having sex with her son's classmate many times, her instincts begin to crave the ache in her womb, and her reason begins to erode...