When Hideo returns home after being laid off, his family members coldly welcome him back. However, only his younger brother's wife, Jun, gently encourages Hideo. Flirting with Jun, Hideo rapes her without even thinking! Jun resists, but Hideo's sincere feelings lead him to forgive him, and the brother-in-law and sister-in-law become immersed in a forbidden love affair. On a tropical night, their sweaty bodies intertwine...