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Yuriko, an aunt, is letting her nephew Shoichi, who has come to Tokyo to continue his studies, stay with her. Shoichi, whom she has loved since he was a child, has become a fine young man, and she can't contain her excitement, stimulating his youthful sexual desire at every opportunity... For Shoichi, who is not used to women, Yuriko's seductive and seductive behavior is a real game-changer. His penis is already at its limit, but he manages not to cross that final line. Meanwhile, Yuriko, fed up with Shoichi's refusal to give in, calls his senior, Muneyuki...