User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-189.129.72.199-20130209174239/@comment-33447191-20130209224333

Volume 8 and 13 are compilations of Short Stories which you can read at Baka-Tsuki


 * Volume 15 is also said to be a collection of Short Stories, and is due for release on May 31, 2013.

Only one of the Short Stories that hasn't been included in any of the Volumes has been posted on n0m@n's blog, titled "Let's Go to Onsen" which you can read here: http://shincodezeroblog.wordpress.com/highschooldxd/short-stories/dragon-magazine/lets-go-to-onsen/


 * Regarding the side stories, while I found one of them translated on n0m@n's blog, I doubt that he has translated any of the others, due to the fact that he would never know, when they might be added to one of the short stories compilation volumes, which would make his work, on translating that short story a little redundant (since, I believe it has been mentioned, that some short stories are being reedited, once they get chosen into the compilation volume).

Not to mention, I fear that, due to High School DxD's popularity, almost every one of the short stories that have been created so far, are going to make it, into one of the compilation volumes, sooner or later. - (Taken from Animesuki)