Yuu Kawakami, Haruko, who is about to get married, visits her grandmother's house with her brother Junichi for the first time in 20 years. There, they find an old zashiki-roku (a hidden room). When they ask their grandmother, she tells them that their great-grandmother was once confined there. That night, Junichi has a dream. In the dream, a woman with the same name as his great-grandmother is repeatedly raped by different men in the zashiki-roku.
