Manga is good & so the anime is, but when it comes to light novel which the series will be following, my opinion will change. Till now Manga & the anime has not shown any point which can be a counted as down-point, but as the story will continue it'll show in the future. Both anime & manga will follow light novel as those will serve as the source. I read till 8th volume of the light novel, i didn't read it after that, so yeah I'll also be taking that into consideration.
Light novel as good till the point of 7th volume, after that it just becomes so easy going with the MC being so lenient against his status that he is not content with how those having low status than him address him. OK, simply it can be said that it just doesn't have that robustness when people address to the MC, & he just leniently goes along.
There were many parts which could've been different & also it could've changed the story into a whole different story, but it just goes like all those shows-"oh we're all friends" or "lets be friends". The whole story just goes into a different direction when things like these just goes wild into story. For eg. have you seen a demon lord casually talking to the servant of another demon lord, I'm not considering the fact that both are from the same world, because its a different world.
As the story moves forward, the MC just becomes so lenient that its just frustrating that this story doesn't have that thing, otherwise i would've seriously considered it as a top notch pick. The leniency as the part of character is OK till some point, but seriously the story & the whole things loses its places when the MC is so lenient that he allows himself to be declared as beaten by Hinata Sakaguchi, even though he won, points like also shows the that it just could've gone into a totally different scenario, if only the MC could've been more rational & also it would've been more interesting that way. Forming Alliance is a different thing, but being declared as defeated is seriously a different matter.
Also while negotiating, the things could've been a bit different. Serving well, showing courtesy to extreme level, Being declared as the loser in the fight against hinata & seriously there are more things which were seriously not needed. Holy crusaders(normal soldiers) talking with a Demon Lord with the reference of "dono". Like seriously?
As i read further it just motivated me to drop the Light Novel. As the manga & the anime will follow on its route, I'm dishearten that actually a story with this much potential will go down. Of course there are people who just likes it, but for me the things of leniency just kills it.
So basically the story & plot both are actually worth listening & reading to & it had quite potential. but that leniency part got me.