DHA sono nana!

is the seventh 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 2007.

Synopsis
Please listen, everyone! As the days of seven demon girls seducing me with their own hands in an attempt to "corrupt" Mitsu-kun, this time, I finally made a big success ...! In order to prevent "corruption", I showed off my underwear to Mitsu-kun ... to prevent "corruption" !? I didn't do it because I liked it! And in the play, I kissed Mitsu-kun, and I couldn't help it! Furthermore, I arrived at an uninhabited island with Mitsu-kun ... I was wondering what would happen at this time ...

(source: Bookwalker JP - Translated)