Seiyatsu no yado: ugokumeku mejiri (2000)

Mayuri runs a rural inn that is struggling for business. Miku, a young woman with a troubled past, begins working there. Mayuri’s younger brother, Kazuhiko, abandons his girlfriend, Yukiko, and becomes consumed by a passionate affair with Miku. Ginji, a servant who spies on their illicit trysts, reveals the truth to Mayuri. Driven mad by jealousy, Mayuri forces Miku into sexual acts and imprisons her. Kazuhiko attempts to flee with Miku but is caught by Ginji. Ultimately, a hidden truth concerning Mayuri and Kazuhiko comes to light...