The Abe and Motoda families lived in the same apartment building and had developed a close, familial relationship. One day, a graduation party was held for the Abe daughters, Momoko and Natsuki. That night, meant to create unforgettable memories with friends and family, Natsuki is suddenly assaulted by Momoko's father, Koji. Nine years later, Natsuki moves to Tokyo and gets married, but due to her husband's job transfer, she returns to her hometown. Her reunion with Momoko—and with Koji—triggers the return of a buried nightmare.