Hideki's computer, the persocom Chi, has been kidnapped. Chi is not an ordinary computer because she is a Chobit, able to learn so much she almost seems human. Now that she's gone, Hideki wonders if a persocom's memories, stored on a hard drive, can be erased. Chi has proven that she can be dangerous, despite her innocent exterior. She knows there are secrets in her past and her quest to complete herself will not stop.