The Utsuro naru Regalia series is apparently written by the same author as Strike the Blood. You wouldn’t know it from reading the first book (Corpse Reviver) though, as it bears no resemblance to that series… what it reminds me of instead with the military focus, post-apocalyptic setting, and dragon powers is God Eater.
A solid enough start all things considered.
The seventh Kuitsume Youhei novel meanwhile switches things up a little from the previous ones in the resolution department. The general outline is much the same however (which to me at least is a good thing), so don’t expect any surprises.