Yui, an average schoolgirl residing in a future where a solitary global network named COMNET upholds all computers, is challenged to save the entire system after a disastrous computer-lab blunder. A raccoon-looking corrector computer program, IR, approaches her and discloses that she must thwart the threatening rogue A.I. computer program, Grosser, and his accomplice programs from taking over the world. Grosser's initial function was to be the manager of all of COMNET. Although she lacks skills and knowledge in dealing with computers, and is initially hesitant to play the role of the heroine, Yui must step up to the challenge to save COMNET. This will entail locating and gaining the trust of the seven other wayward corrector programs, as well as finding the creator of COMNET, Professor Inukai, to permanently stop Grosser.