Yui is an ordinary schoolgirl living in a future where all computers rely on a single global network called COMNET. Yui is computer-illiterate, but after an accident in a computer lab, she is approached by IR, a raccoon-like corrector program, who tells her she must save COMNET. She has to stop the rogue A.I. (Artificial Intelligence) program known as Grosser and his hench-programs from taking over the world. Grosser was originally designed to manage all of COMNET. At first, she is very reluctant to play the heroine due to her complete lack of knowledge and ability with computers. To save COMNET, she must find and gain the trust of the other seven wayward corrector programs. They must also find the creator of COMNET, Professor Inukai, to help stop Grosser for good.