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Tradition passed down to the family with huge breasts ... It is that if a son is born, the mother uses the huge breasts to take away the virginity. Naho and Rin, the busty sisters who learned the legend from their mother, Fumie, struggled to write down their sons, but they were struggling. One day, the sisters take their son and return to their parents' home for the first time in a while. When Fumie hears that her grandchildren are still virgins, she decides to perform a ritual. It was that Naho was Rin's son, and Rin was devoted to obscene acts with Naho's son...