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One day, a mother who witnesses her son (Toru) watching AV and masturbating. Knowing that her son can't get along well with a woman, her mother tries to use her body to immunize the woman, but ... she's worried about her son's caress and sex mess, which only has AV knowledge. Then, the mother's sex education for her son began ... The son and mother, who gradually improved, were in the same body over and over again ...