User blog comment:B214/High School DxD EX/@comment-207.96.205.2-20160501025841/@comment-26345952-20160501030952

Its kinda of a mix. Yes it does set itself in the LN series but is not going to change much. I think this is Ishibumis way to say who are the lucky few who end up with Issei. And to give us a hint of the future of DxD could be.

Official(so so) Spin-off (most defently)