Transferred back to his hometown from a provincial assignment, Ayumi's brother-in-law Hiroshi found himself constantly stifled by the cramped family life. One sweltering tropical night, as oppressive humidity filled the air, Ayumi—his younger brother's wife—appeared before him in a damp, sleep-soaked state. Overcome by mounting frustration and desire, Hiroshi succumbs to temptation when the house is empty, taking Ayumi by force. How will she respond to her brother-in-law's transgression? The intense, sweat-drenched passion between man and woman thickens the night with forbidden heat...