Riho often hangs out with the narrator and his girlfriend, but whenever the girlfriend looks away, Riho holds his hand or presses her body against him, making her attraction obvious. When his girlfriend leaves for a three-day family trip, he and Riho fall into cheating sex on the very first day without either openly making the first move. They spend the rest of the visit making up for lost time, fucking again and again and doing little besides eating and sleeping. Their private three days race by as his girlfriend's return draws closer.