Sayonji Akitsugu is the heir to his father’s vast fortune. But he hates his father because he holds him responsible for his mother’s suicide. When his father unexpectedly dies, Saionji is the least likely to claim the family inheritance. But, his secretary, Sannomiya Rei, convinces him to change his mind. He finally arrives at his ancestral home, a luxurious mansion full of docile maids, who he believes were only needed to serve their now deceased master… Ah, if only it were that simple, a new murder occurs at the castle, and Sionji decides to conceal this fact from the public in order to investigate the case himself…