Let's sum this entire manga up with random thoughts generated from the story!
Black Company, Black Company, Do The Monsters I've Tamed Have More Personality Than Me... Nah couldn't be, Black Company, Who the hell drew my FACE!!!??, Oh I'm a Sage with tons of spells.. should i research those spells to see how capable I am?... Nah let's not bother unless it forces the plot then I'll have something, Black Company, Where did my emotions go I wonder?, Hmm I wonder why I still have no grasp of my own power after defeating things no human is able to?, I worked for a black company once, I don't want to be made to do things so I'll just take care of everything, Oh look bad guys live here... Let's DESTROY the ENTIRE economy!!!!! Who cares if not just bad people live in that place!
Hope that gives everyone a idea of what this manga is about.