Two brothers kidnap and abuse women. Once the new woman's "training" is complete, the previous victim is released.
Woman's Bedroom: Lusty Competition
Hizoban Higasa no onna
Nyan Nyan Musume
Nise mibôjin - Ichijiku hakusho
Nurse Girl Dorm: Sticky Fingers
There Is a Japanese Woman in My Room
Favorite Concubine