Masashige lives a well-off but vacant life. One day, he receives an invitation letter from his friend Harumichi. Masashige visits his house with his sister, Kasumi, and his friend, Kounosuke, who are also invited by Harumichi. However what they face there is the sudden death of Harumichi... After the funeral, Masashige is informed by Caliban, the only butler in Harumichi estate, that he will receive a part of Harumichi's inheritance. There is a beautiful girl in a pure white dress in the basement of Harumichi's house. When Masashige whispers to her, she opens her green eyes and says "My master..." The butler tells him "You can do whatever you want to her..."