A man named Chisato Shoda has been neglecting his wife, spending all his time drinking and gambling, often causing trouble at home. When she turns to her brother-in-law for advice, he snaps and becomes abusive towards her. While nursing his injured brother-in-law back to health, they both find themselves aroused and eventually engage in sexual activities. Their relationship continues as they grow closer physically, but things take a turn when the brother-in-law discovers something strange about his sister's behavior.

千里の夫は酒とギャンブルに耽り家でも暴れる始末。千里は義弟に相談するが逆切れして暴力を振るう夫。ケガをした義弟を看病しているうちに、お互いムラムラしてしまいエロ行為に及ぶ。その関係は続き体を重ねる二人。しかし、義弟は様子のおかしい千里の秘密を知ってしまう。