The story revolves around the four brothers of the Shiraki family, fighting to protect their estate. The eldest left home at a young age, the second inherited his stepfather's hospital, and the youngest lives in a university dormitory. The third son, Kensan, married Yuko, and together with his mother they lived happily—until her husband suddenly died in an accident. Then, even before the first anniversary of his death, his mother also passed away. In her will, she declared, "When I die, this house belongs to you," leaving Yuko determined to protect the cherished mansion filled with memories. However, one by one, her late husband's brothers begin moving into the estate, each setting their sights on the vulnerable widow's body. How will Yuko survive this escalating crisis?