DHA sono ni!

is the second 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 May 2005.

Synopsis
Hello, this is Ai Shiratori. As usual, my favorite Mitsu-kun is seduced by seven devil girls. Kusun. I'm just talking about "sin" and "corruption". In order to save Mitsu-kun from such girls, I have to make a "contract" as soon as possible ... What is a "contract"? Well ... that's uh ... I can't say that !!

(source: Bookwalker JP - Translated)