Unfaithful wife Yuki, having her anal virginity taken by an older man nearly old enough to be her father, is forced into rigorous anal training. This collection documents her year-long life as a married woman turned livestock. Part 4 features detailed scenes including "married woman anal toy torture," "dual-female anal pegging intercourse," and "orgasmic anal fisting," thoroughly depicting her progression from anal intercourse to full anal fisting.