Unfaithful wife Eri awakens to the pleasures of captivity and training, walking the path as a sex slave for men. Driven by loneliness and emptiness, she transforms into a beast, endlessly devouring pleasure with insatiable hunger. The married woman's anus, thoroughly developed and subjected to repeated enemas and defecation, is on the verge of collapse. Her body continues to mutate into a new being, completely dominated by desire.