Mizuki has had an incomplete melody haunting her dreams. In a time when she feels hurt by those around her, she stumbles upon a mysterious mansion with the familiar tune drifting from somewhere inside. Inside she meets Adam, who tells her he has written the song for her. After a week together though, he tells her that he must leave. She tries to follow but gets involved in an accident and soon finds herself trapped within the house, confused about her true identity. Who is Adam and how is he related to her?