SWH-005 - Showa Era Erotic Mansion: Housewife Kawakami Yu Trapped in the Dungeon

Haruko (Kawakami Yu), about to be married, visits her grandmother's house with her brother Junichi after 20 years. They discover an old, ominous dungeon. Their grandmother reveals it once held their great-grandmother. That night, Junichi dreams of a woman with the same name being ravished by men one after another inside that very prison.