The wealthy Mitarai family has been running a hospital for generations, but one day, misfortune suddenly struck and their mansion was engulfed in a vicious fire. Thirteen years later, Murata Kyoko (played by Nagano Mei) knocked on the door of the Mitarai family, hoping to be a housekeeper. The one who answered the door was an icy beauty, Makiko (played by Suzuki Kyoka), the second mistress of the family. Kyoko was hired to take care of the housework at the Mitarai family, but she actually had ulterior motives. Her real purpose was to wait for an opportunity to investigate the truth in the mansion...