After surviving four years of high school, Hideki Motosuwa aims to enter his preferred university by attending cram school in Tokyo. At the same time, he works daily shifts at a bar to make ends meet, which causes him to miss out on the world's latest invention—human-like computers known as Persocoms. Yearning for a persocom of his own, Hideki gets lucky when he discovers a cute, abandoned persocom in a garbage pile. After locating the power button, Hideki realizes his new robot is defective and can only say the word "Chii"—which he decides to name her. However, Chii is not an ordinary persocom: she is capable of independent thought and learning, making her a legendary type of robot called a Chobit. Now, Hideki must teach Chii how to live a normal life and uncover the truth behind the mysterious chobits series.