It's summer...the hot summer, when even the slightest movement makes you sweat, has arrived at the Morishita family home. One day, the Morishita family's water heater suddenly breaks down. Even though it's summer, they can't spend a few days bathing in water, so her husband advises her to borrow the bath from the Nishizawa family next door... The next day, Asako is happy to get permission from the head of the Nishizawa family and immediately borrows the bath. However, at the same time, the Nishizawa family's only son, Manabu, is also heading to the bathroom to take a shower...