In the year 2020, computers are everywhere. From digital teachers to self-driving cars, computers are an integral part of everyone's lives - everyone's, that is, except Yui Kasuga's. The 14-year-old daydreamer can't tell a Pentium chip from a Dorito! Very shortly, she will be called on to save the world from the mother of all computer viruses... and she can't even be bothered to stay awake in class!