Yurie Matsushima & Eriko Miura co-star 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 is customary for these two couples to return to their husband's birthplace only on the anniversary of the death of Toshizo, the head of the Oshima family. Burn incense at Toshizo's Buddhist altar and talk to Mitsuo, the third son of the Oshima family... This year is no different from the usual summer scene of the Oshima family. However, Mitsuo is different. Mitsuo has a plan... A plan to drive his two sisters-in-law into despair...