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The four Shiraki siblings live in a mansion. The eldest son ran away from home at a young age, the second son took over his father-in-law's hospital, and the fourth brother moved into a university dormitory. Yuko married the third son, Kenzo, and the three lived happily together with her mother-in-law. However, her husband suddenly died in an accident... and before the first anniversary of her death, she also lost her mother-in-law. "When I die, I'll give this house to you." In her grief, she tries to protect the house filled with memories, keeping in her heart the words of her mother-in-law: "When I die, I'll give this house to you." But one by one, her husband's brothers move in, aiming for the mansion and the widow's body...