The company where my brother-in-law worked went bankrupt, and he is staying with his parents for a while. He feels uncomfortable because his younger brother, who lives at home, always makes snide remarks about him, but his younger brother's wife, Momoka, treats him warmly. My brother-in-law is attracted to Momoka and can't help but rape her! Momoka resists, but she opens Kokoro to her brother-in-law's sincere feelings... On a tropical night, the two of them are covered in sweat and are passionately seeking each other.