Naho was returning home after completing her driver's license road training when she ended up stopping by the house of her female instructor, Riri, who had been sitting in the passenger seat. Once inside, Naho drank a beverage prepared by Riri and gradually began to lose consciousness. Smiling with satisfaction, Riri pulled out a new training file. What was about to begin was Naho's first experience in restrained lesbian M slave training—an entirely new experience awaiting her right there on the spot.