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Yu lives with her husband, who is away from home, and her son, Yoshio. Yoshio's tutor, Oki, comes to study with him, and two of his friends are curious about his beautiful mother. Oki and Yu's forbidden love affair involves friends and falls into an even more obscene pleasure world. Even though he is confused, he can not refuse the desires of Oki and his friends, and gradually opens his body and asks for it.