My brother's wife has always been kind and secretly desired by me... One day when my brother went out on a business trip, we were suddenly hit by a heavy rain!? Alone in their spacious house, my beautiful sister-in-law and I found ourselves soaked together. Her wet hair glistened seductively, her clothes dripped water, and her plump breasts peeked through her drenched top... I couldn't take my eyes off her vulnerable figure. And before I knew it, I had lost all reason and indulged in her wet, exposed body, giving in to my desires completely...

兄夫婦の家に居候する僕。義姉の絢さんはいつも優しく密かに想いを抱いていた…。そんなある日、兄が出張へ出かけていくと突然の豪雨に見舞われて！？誰もいない広い家にビショ濡れになった義姉と二人きり。雨晒しで艶やかに濡れた髪、衣服から滴る雨水、そして濡れ透けた豊満な胸元…。僕は無防備なその姿から目を離せずにいた。そして理性を失った僕は流れのままに絢さんの濡れ透けた肉体を、想いのままに貪ってしまって…。