Yuna is a beautiful wife who has been married for five years and lives with her husband in an apartment. She is good-looking and kind, but because of her beauty, she is targeted by the men in the neighborhood, and is kidnapped while her husband is away. She is confined and trained in an iron cage, collared and gagged, for days. The humiliation of being violated, with loose saliva dripping out from the gaps in the gag and moaning, gradually causes the beautiful wife's mind to break down...Yuna gradually begins to feel pleasure from being confined and trained, and Kokoro is taken over...