Forty-something beautiful mature women Yurie Matsushima and Eriko Miura appear together for the first time! The eldest son of the Oshima family, Yoshiyuki, and his wife, Yurie. The second son, Kei, and his wife, Eriko. It was a tradition for these two couples to return to the family home of the husband on the anniversary of the death of the head of the Oshima family, Toshizo. They light incense at Toshizo's Buddhist altar and chat with the third son of the Oshima family, Mitsuo... It was the same summer scene at the Oshima family this year as always. However, Mitsuo was different. Mitsuo had a plan... A plan to plunge his two brothers' wives into despair...