Radwin no Bouken

is a Japanese light novel series written by Tomohiko Mizufuji, with illustrations by Seiji Kikuchi. The series began publication on December 10, 2008 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
An era when magic was still moisturizing life. The boys Rad and Senema meet the aristocratic girl Enil in a town where they stopped by to take the knight's exam. But for some reason she could only be seen by Rad and had no memory of her birth. Enil seems to be a spirit. Rad decides to go on a journey together to regain her memory. Before the spirit Enil, who has no resident, disappears.