User blog comment:B214/High School DxD EX/@comment-3965848-20150727141624

I've gone back and forth on all this, but I think I've concluded that this story is like semi-canon, as in it can be part of either LN and/or anime but at the same it isn't.

Cause at the end of EX, it will be as if this story and BorN never happened at all in either timelines, so the LN timeline will remain the same as it is and the Anime timeline will follow it more accurately albeit with some slight difference.