The Description:
 The story centers on the life of Hideki Motosuwa, a repeat student attempting to qualify for university by studying at Seki prep school in Tokyo. Besides a girlfriend, he dreams of having a persocom (パソコン ?): an android used as a personal computer, which is expensive. On his way home one evening, he stumbles across a persocom in the form of a beautiful girl with long hair lying against a pile of trash bags, and he carries her home. Upon turning her on, she instantly regards Hideki with adoration. The only word the persocom seems capable of saying is "chi" (ちぃ ,Chii?), thus he names her Chi. Hideki assumes that there must be something wrong with her, and so the following morning Hideki's neighbor Hiromu Shimbo tries to analyze her with his mobile persocom Plum, and after Plum crashes concludes that she must be custom-made.
 Shinbo introduces Hideki to Minoru Kokubunji, a twelve year old genius who specializes in the field of custom made persocoms. Minoru's persocoms, including Yuzuki, a fairly exceptional custom made persocom, are not able to analyze Chi either, and thus they conclude that she may be one of the Chobits, a legendary series of persocoms rumoured to have free will and emotions. Although this could be a possibility, Minoru is confident that it is only a rumour. Yuzuki also adds that she does not resemble any persocom model in any available database and so she must be custom made after all.
 A major part of the plot involves Hideki attempting to teach Chi words, concepts, and appropriate behaviours, in between his crammed schedule of school and work. At the same time, Chi seems to be developing feelings for Hideki, at an emotional depth, which she is not supposed to possess, and Hideki struggles with his feelings for her. The need to figure out more about Chi and her mysterious functions and past becomes a stressing pull for the characters in the series... (The material was taken from Wikipedia)