Yukari waits each day for her husband, who has left to work elsewhere, living with her son Kenta in a modest household. Though far from wealthy, they find contentment in their simple life. One day, their room's air conditioner suddenly breaks down, and they can't afford the repairs. Enduring the sweltering heat, Yukari sets up an old kiddie pool in the yard that Kenta used to play in, and the two enjoy splashing around together. As they chat in the water, Yukari briefly forgets the heat—until Kenta finds his eyes drawn to his mother's wet, translucent blouse, her breasts clearly visible beneath.