Forty-year-old beauties Yurie Matsushima and Eriko Miura make their first appearance together. The eldest son of the Oshima family, Yoshiyuki, and his wife Yurie, along with the second son, Kei, and his wife Eriko, have an established tradition of returning to their husband's family home every year on the anniversary of the family patriarch, Tosaburo's, passing. After offering incense at Tosaburo's altar, they spend a warm, peaceful time together with the youngest brother, Mitsuomi, making it an annual summer ritual. However, something was different about Mitsuomi this time. He had devised a plan to plunge both of his sisters-in-law into utter despair. What exactly is this plan? A shocking incident unfolds, threatening to tear apart the family's bonds.