On a very weak level this manga show that behind some decision, if they concerns a lot of people, are complicated reasons. That you have to think over a lot of factors and which are not every time really obvious. It's nice that somebody could take more interest in economics and/or the dynamics in human societies after reading this manga. This is handled on a very low level, so that the reader is not possibly overwhelmed. Besides this education edge and some political maneuvering this manga have not very much story for the characters themselves. The political maneuvering is told in a way like a edutainment documentary, very often whit some background information in the form of charts and pictures. And if you like to make Clausewitz famous quote ("War is merely the continuation of policy by other means.") your own than even the war stories are also only political maneuvering. The characters are only shown if they are needed to transport something for the political story or for educational purposes (to educate, indirect, the reader). So this manga is not about people (and their personal stories and sorrows, etc.) but about politics.
The characters are shallow and almost pure archetypes. Even the two main characters, the Hero and Demon Queen, are quite shallow. The characters are mostly reduced to their function/profession as a character trait. Which is represented also in their names: they have no names. They are called whit their function/profession (i.e. "young merchant" or "head maid"), which is something strange. What also strange is, is the use of some 21-st centuries knowledge in this manga by the characters in this fantasy world (late middle ages like technology/education setting). There is no explanation for this wisdom, only that the Demon Queen is few hundreds years old and coming from a scholar family (which is IMHO a very cheap explanation).
Somebody has written as a comment this manga use Deus ex Machina as plot device. This is untrue. Except for that, that the (human) Hero which wanted to kill the Demon Queen is persuaded in 5 min. by her to help her. But this is the setting of the whole story so it's OK.
Also somebody has written that this is drama and comedy. Per definition it can't be both (drama is when a play is neither comedy or tragedy). Because it's not about humans (or demons=humans) but about politics this hardly a drama but is more edutainment documentary. You could say there is a comedy part, because the Hero is asexual, he has no testosterone at all. He can't understand what his harem (till chapter 16 three women want to marry him) want from him to do or what women basically like to hear from a man. So this had to be funny when the Hero is more dense than lead, when a women try to seduce him.
Last thing the art: the main characters are drawn quite good, better than in an average manga. Side characters are still OK but had no details. All background (whit some few exceptions) and all supernumeraries are drawn bad. Some few(!) panels are so bad drawn that even me, and I can't draw, could easy made it much better. This few panels reminds of drawings of 2-years-old children or worse, really. This few panels give the impression of cheapness.
In conclusion this manga has some good points but I don't really like the whole thing. But it's only me, the education part is nothing new for me and manga looks to me somewhat like pieced together from different puzzles. If you like to learn, in a easy way, some few basics of economy and dynamics in human societies (especially in wartime) than this manga is a good teaser for the real thing. Read it, if you have some time and have never had thoughts about economics and politics. If you have no time than it's no loss if haven't reed it either.
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