I remember binging the Entire series in the middle of last year. I was expecting mid but stumbled upon treasure randomly. Yes the MC is the usual "Last Survivor Doom bro," but he carries a hardcore philosophy from the military. If anything, this is the only series where not just the MC but most characters are associated with the military. Due to this, every chapter enforces them to follow the rules of war even going against the Magical threats. It is also cool to see an MC actively use the material of "METAL" with it's own pros and cons. He may be clumsy at times but he makesup for it with an iron fist of virtue.

I have a favorite quote from this Manga:

" War is not a sport "
There is no need to play fair against criminals who have done god knows what