After failing the university entrance exam, Hideki Motosuwa decides to attend a tutoring course in Tokyo. He also looks for a part-time job to earn a little money. In this city, he discovers the “Persocoms”, personal computers in human form. One evening, the young man discovers an abandoned Persocom in a pile of garbage that looks like a beautiful girl. Fascinated, he decides to take it home with him and activates it. This Persocom only repeats the same gestures and can only say “Chii”. Hideki calls her that and gradually teaches her to speak. But maybe Chii is no ordinary computer? Maybe she is a Chobit, a persocom with a power beyond imagination?