The daughter of the maid, Kaoru, was kidnapped by mistake for Izumi, the daughter of the Shokura family. Because Izumi's father, Yo-suke, hesitated to pay the ransom, Kaoru was killed. The maid, Yuriko, harbored a grudge against Yo-suke and Izumi. A year later, Izumi was abducted by someone and went missing...
