Hideki lived his whole life on the countryside, he actually wanted to study at a university in Tokyo but failed the entry exam and moved there anyways to visit an orientation program. Arriving in Japan's capital, he notices how almost every person walked around with some kind of robots called "persocoms". When his best friend tells him that they work just like a computer Hideki decides to get himself one, since he always wanted a PC but they were too expensive for him and almost having given up, Hideki walked home in disappointment, only to find a mysterious beautiful girl lying on the trash. He immediately came to know, she was a persocom and wondered, why someone would throw such an expensive computer away. She seemed just fine, Hideki thought, so he took her home but noticed soon after that she wasn't like the other persocoms...
Chobits