When computers begin to resemble humans, can love remain unchanged? Hideki Motosuwa is a young country boy studying hard to enter college. Coming from a poor background, he can barely afford his expenses, let alone the latest fad: Persocoms, personal computers that look exactly like human beings. One evening while walking home, he finds an abandoned Persocom. After taking her home and managing to activate her, she appears to be defective, as she can only say one word, "Chii," which eventually becomes her name. Unlike other Persocoms, however, Chii cannot download information onto her hard drive, so Hideki decides to teach her about the world the old-fashioned way, while studying for his college entrance exams at the same time. Along with his friends, Hideki tries to unravel the mystery of Chii, who may be a "Chobit," an urban legend about special units that possess real human emotions and thoughts, and love toward their owner. But can romance flourish between a Persocom and a human?