Hideki Motosuwa worked hard for four years in high school and is now attending cram school in Tokyo to achieve his dream of getting into his desired university. To support himself, Hideki also works at a bar but doesn't have the luxury of keeping up with the latest technological advancements, such as human-like computers called Persocoms. Despite his desire for one, his financial situation simply won't allow it... until he discovers an abandoned Persocom in a garbage pile. The robot is faulty and can only utter the word "Chii," which Hideki decides to name her. Little does he know, Chii is not an ordinary Persocom. She is a legendary type called a "Chobit" who can think and learn independently. Now, Hideki takes on the responsibility of teaching Chii how to live like a regular robot while uncovering the secrets of the elusive Chobits series.