[Machine Translation] The bodies of Koji, a member of the Hieda family, a large conglomerate, and a young woman were found in a car that had fallen into the sea. Is this a murder disguised as a suicide? In the course of the investigation, Katayama becomes engaged to Miyuki, the daughter of the Hieda family. One after another, incidents occur at the Hieda family's mansion, which Miyuki calls "the house of death. What is the truth behind the complicated relationships between the big zaibatsu? And what will happen to Katayama's true love...