Yui Kasuga (Yui Kasuga) - ordinary girl who lives in the future,where computers - an integral part of everyday life. And they are all combined into a huge network, known as ComNet (COMNET). One day, while sitting at his computer at school, corner of my eye catches Yui orange object on the screen, but it immediately disappears. She decides to take the disc home to see what had happened. After loading the disc,orange raccoon named IR (I.R.), which is part of the " Proof " program (Corrector), reappears on the screen. He tells her that the virus with an artificial intelligence known as Grosser (Grosser), making a mess and destroying cyberspace ComNet. And only Yui can stop him.To do this, she must find and tame the remaining seven parts of the program " Proof," by which she will be able to stop from Grosser capture the world of computers and the whole of humanity.