Since Hiro `s parents died, he and his sister lived separately.But as soon as my sister got a new job superintendent creepy old mansion, she sent Hiro a letter asking him to come and live with her. Having arrived and met no one in the family house, Hiro goes to the city to find his sister. Instead, he finds a new mistress of the mansion and saves her. Unfortunately,This heroic act badly affected his health, and Hiro is dying. However, fortunately or maybe unfortunately, it is the mistress of the mansion Princess Monsters Hiro and give a second life, but only on condition that he would be her servant.