DHA (Volume)

is the first volume of the DHA light novel series, written by Rin Yuuki and Illustrated by Yuta Komiya. It was released under the Dengeki Bunko Imprint in January 2005.

Synopsis
Oh, nice to meet you. I love swan. Actually, my classmate Mitsu-kun, who is sitting next to me, is being tempted by the devil ...! The devils are dressed as cute girls, but aiming for the "corruption" of Mitsu-kun, such things and such things ... It seems that in order to prevent Mitsu-kun's "corruption", he must make a "contract" with me. ...... But "contract", that is, that ... no, I can't say!

(source: Bookwalker JP - Translated)