When computers begin to resemble humans, does the concept of love remain unchanged?
Hideki Motosuwa is a young boy from the countryside working hard to pass his college entrance exams. Coming from a poor family, he can barely afford his everyday expenses, let alone the latest trend: Persocoms—personal computers that look exactly like human beings. One evening on his way home, he stumbles upon an abandoned Persocom. After taking her home and successfully turning her on, she appears to be faulty, able to say only one word: "Chii," which becomes her name. Unlike other Persocoms, Chii cannot download data onto her hard drive, forcing Hideki to teach her about the world the old-fashioned way while simultaneously studying for his college exams.
Together with his friends, Hideki attempts to solve the mystery behind Chii, who might be a "Chobit"—an urban legend about special units capable of genuine human emotions and thoughts, along with love for their owner. But can a romance truly develop between a Persocom and a human?