User blog comment:B214/Question and Answers 2/@comment-24098614-20140502234528/@comment-1359322-20140503003135

I think Ishibumi once mentioned that he wants to do another story on the DxD-verse but on a new religion and new main character.....

"The truth is I’m writing about a different story. I’m thinking it would be good if it can get released while doing DxD. That happens in the exact same world as DxD, but I’m hoping it will turn out to something both DxD and new fans would enjoy. Currently, my priority is DxD so please wait patently for it."

- Volume 8 Afterword

This is the closest i could get to. >____>