Personally I don't have a problem with the age gap the reasons being because, one trying to apply modern standards to a world of manga is weird in itself. Two in the past of the real world girls were married between ages 12-18, if you were past 18 you were considered an old maid and unmarriageable. And three even in modern times you can still get married at 15-16 years old with permission from the parents (knew someone who got married with her parents permission) or if you are emancipated and are considered an adult. Also I have heard of 18y.o. marrying a 90y.o. in modern times so I try not to judge to much. What I have a major problem with is when they are forced to do so and have no say in their life. The former king and Rodan gave her the choice, as it would be the best way to protect her, as she is considered marriageable in that world. If she was kidnapped and forced to marry maybe in their world they can force a contract on someone without consent that they can't do anything about (just guessing don't know for sure). The former King and his group won't do it because they have a conscious but doesn't mean other's won't. Current Nylle family an example.
While I usually have a problem with HAREM manga's or novels, I started to read the novel of this manga before realizing it was a harem. And in my opinion I actually like this one, it isn't really annoying like most others, at least in the novel, will have to see how the manga portrays it. But again this is just my opinion!
Umm... this is just my opinion but I know people are comparing this to solo leveling but I never had that thought as 1 he had the sky girl with him since the beginning and 2 the only reason he is solo is because he is the only one who can activate the underground dungeons. But to me this can stand on it's own without being compared to solo leveling. And people limit what they read when comparing stories to each other. I do get mad when people seem to be copying others. But people having similar ideas but different ways of applying it and making the story that is what makes it interesting and obviously there will some who totally kill it and some that don't. That's why I love to read all kinds of manga(manhua, webtoons, etc) and novels.
Missing chapters 59-61