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Yuriko (Yuriko Mikumo) desperately resisted her son who yelled and attacked him, "I can't stand it anymore!" From that time when I was witnessed taking a bath, I noticed something was wrong with my son. But no way I'm so lustful for my mother ... There is no way to resist the strength of his son who has grown up into an adult body, and Yuriko eventually gives up resisting and proposes that he should cross the line anyway. "Mother will teach you how to treat a woman." In this way, Yuriko's sex education for her child began ...