Toshihito, the brother-in-law, grows frustrated while job hunting and, unable to resist the absence of family members, forcefully takes his younger brother's wife, Sayuki Kanno. In the sweltering heat of midsummer, their bodies slick with sweat, they engage in passionate sex. Sayuki resists at first, but succumbs to Toshihito's overwhelming desire, getting pounded repeatedly until she's drenched in sweat and orgasming over and over. The intense, powerful moments of their encounter leave a lasting impression.