In a sweltering room with a broken air conditioner, Haruo returns home and discovers his mother, Airi, drenched in sweat. The scent of perspiration emanating from her voluptuous body and her sensual aura prove overwhelmingly intense, stirring deep desires within the young Haruo. Overcome by impulse, he abandons his restraint and lunges at Airi. Surprised at first, Airi soon finds herself unable to resist the passionate advances of her son, giving in to her own suppressed emotions. Amid the suffocating heat, the two engage in a fervent, taboo affair—an act as wet, intense, and destructive as a feverish dream.