On a sweltering summer day, the Enjo family's air conditioner suddenly breaks down, trapping heat inside the house. With her husband away on a work assignment, Hitomi manages household chores alone, dutifully watching over her son's home in his absence. Enduring both the oppressive heat and loneliness, she struggles to maintain daily life. Witnessing her condition, her son repeatedly thinks of her and one night sneaks into her bedroom. The image of his sweat-soaked mother lingers in his mind, awakening new, forbidden emotions within him.