User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-73.157.117.201-20150728114735

I hope there's going to be more stories of High School DxD than just the side stories. Because there is a lot more to explore here. For example the other mythologies, possible harem members, future dangers, and more etc..

And this other world of High School DxD, that needs to be explored as well for I believe it lead to many interesting thing. Like an alternate world/timeline thing, for example Issei's unborn two siblings before him, what if Issei was the one unborn and his two siblings were born into this other world.

This is just a statement/theory of my thought. So what do you people?