The Abe family and the Mochida family live in the same apartment building and are on friendly terms with each other. One day, the Abe family holds a graduation party for their daughter Momoko and Natsuki. On the night of what was meant to be an unforgettable day surrounded by close friends and family, Natsuki is raped by Momoko's father Koji... Nine years later, Natsuki has moved to Tokyo and gotten married. However, when her husband is transferred, Natsuki returns to her parents' home. A reunion with Momoko... and a tragic reunion with Koji. The nightmare she had sealed away is revived...