Defender (Volume)

is the first volume of the Defender light novel series, written by Chiaki Konaka and Illustrated by Hiroshi Ikuno. It was released under the Dengeki Bunko Imprint in March 1997.

Synopsis
Takashi Ito, a young man who pretends to be a data rescue (repair of a data disk) in the back alley of Akihabara. One day, a girl asks to repair an unidentified CVD. Since then, thugs, like fighting games, have begun to appear in front of him one after another. They call themselves "Challengers". In fact, the requested CVD was a startup program to awaken Takashi as a "defender" ... What is Takashi's hidden past, and what is the identity of the mysterious girl?