Ryoko has been raising her only son, Jiro, on her own. They only have the bare minimum of food, and to save on gas, mother and son bathe together... They are by no means wealthy, but they lead happy lives, hand in hand. Then, one day, without warning, the Iori family's bath breaks down. It's the height of summer... Ryoko and Jiro are unable to find the money to repair it, and are at a loss as to what to do while wiping away the sweat that is dripping down their face. Then, a guest arrives to see the mother and son...