Sorry about this, mate. Volume 1 (which I call the introductory volume) was just horrible; the pacing was way too fast, barely any world-building, character design was 2D and "character development" didn't make any sense whatsoever, and the romance (or romance development) was simply garbage. I get that you want to do a character arc for them but that's not how you go for it. I, for one, barely care for any of the characters, much less the MC. So if I don't care for the characters, why should I care if they develop? It's about making us care that they will develop. You barely touch upon the relationship between him and his master and the other princesses too then you added that random one-sided romance, then everything (if there was any) was gone thanks to that war and he left everyone, while others were in fear and in awe of his abilities, he suddenly gained a random obsessive love interest thanks to a DESTINY which we had no idea about since we didnt KNOW about it.
I read volume two but I just didnt care anymore about the previous characters in volume one, aside from the obsessive princess. Much less when you added more characters that still has no personality; in fact, now you're simply using cliches in your characters like the arrogant prince. Hope they-- and I mean everyone from volume 1 and 2--will actually have character arcs, because they are what makes up a story. The same goes for the MC.
My overall point is: I couldnt care less for your novel or how the story will turn out because you, as the author, couldnt write a proper reason for me to stay, specifically in terms of characters.
