One day, Taro spotted and purchased a next-generation humanoid masturbation toy at a shop—one that looked exactly like the older girl from next door whom he had admired and played with in his childhood. He had it delivered that very day and immediately connected it to his PC to boot it up, only to be met with an error message! The setup had failed, and the reconfiguration process would take at least an hour. But his crotch was already throbbing and swollen to the bursting point—he couldn't wait any longer! Driven by desire, he decided to try out the "Naoko" toy right then and there, without waiting for the setup to finish. Yet, as expected of a next-generation toy, the sensation was incredible—so intense that he involuntarily ejaculated right into its mouth! Overwhelmed by the pleasure this ultra-advanced toy provided, he experimented with various oral techniques and climaxed repeatedly. Eventually, the action moved to his lower body as well... Ultimately, the "Naoko" toy—now rendered incapable of further system adjustments—ended up living together with Taro as "Onako."