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Mr. and Mrs. Kosaka will take care of her husband's younger brother, Yujiro, who has come to Tokyo. Honami, who grew up as an only child, was happy to have a brother-in-law, even though she was a brother-in-law, and treated her like a real sister. One day, Yujiro, who overreacted to Honami's words, changed his attitude and set out to act like a surpass. And that act was done even before her husband was there, and Honami had no choice but to be ashamed to kill her voice and endure the rushing pleasures ...