The four Shiraki brothers live in a grand mansion. The eldest son ran away from home in his youth, the second son took over his father-in-law's hospital, and the fourth son moved into a university dormitory. The third son, Kenzo, married Yuko, and the two of them lived happily with his mother. However, her husband suddenly died in an accident… and before the first anniversary of his death, she also lost her mother-in-law. 'If I die, this house will be yours.' Amidst her grief, Yuko remembers her mother-in-law's words and decides to protect this house filled with memories. But one after another, her husband's brothers move into the mansion, eyeing both the property and the widow's body…
