I actually like this novel, it's done pretty well and it fulfills its purpose of being a pretty lighthearted comedy power trip wish-fulfillment novel. I don't find the part about him gradually becoming more human again to be an issue, it's pretty interesting to see how he's regaining the humanity he lost.
There is also no real chance of you taking this seriously, neither should you. It's a rather stupid novel in many ways and the way it handles peoples thoughts and conflicts is juvenile at best. The reason for me liking it quite a bit is just that it's easy to read, easy to swallow and it's nice as a wish-fulfillment novel with nothing much other than that going for it.
What DOES piss me off, though, is the mc's attitude towards his harem and his situation. The author seems to think he's cool, but I just can't handle how stubborn and annoyingly fixated he is on monogamy and going back home.
If the author had kept it within reasonable limits, it would've been acceptable, but you quickly get tired of hearing that his only motivation for everything is going home. He has EVERYTHING but he just wants to go back home. I can understand the will to go home, but his situation isn't horrible anymore after the first dungeon, he also meets a lot of people he cares about. I can't agree on the mindset that he'd just want to abandon that entire world which made him who he is. I mean, it'd be fine if his goal was to find a way to make it possible to travel back and forth between both worlds, that'd be more understandable, especially with his power, but he just wants to go back home and doesn't care about that world at all.
I can still take that though, it doesn't matter that much. What I hated the most was the relationships. Not because I disliked the girls, no, I liked pretty much all of them to varying extents. What absolutely made me despise this author's way of doing things were that the mc is HELL-BENT on ONLY having one special girl. "Oh, but isn't that good? That he's faithful, etc" you might think. Yeah, I would've respected him for it. I like gradual development, when they don't just fall in love at first sight, I absolutely hate love at first sight, it disgusts me.
What pisses me off is that it's clear from the moment they're introduced that they love the mc. Every girl loves him and if they don't, they're falling in love soon enough. They also confess soon enough or at least the mc WILL be aware of it. He's not the dense fcker you'd usually find. They're actively trying to get his attention and love. But he acts like a dck to all of them and not in a good way. Sure, that's fine. Take it slow. But the thing is, he keeps on saying and thinking over and over and over and over and over again that the vampire girl is the only one who's special to him. None of the other girls are special to him. Even towards the end, he's still on about the same sht. He likes the girls more and more, he also finds them more and more attractive, but he's hell-bent on claiming that they will NEVER be special to him. Not even when the vampire girl herself gets sick of his sht and tells him to f*ck the other girls or at least accept them does he do so. Nope, he just refuses because he has this weird worldview that monogamy is the only way to go.
It doesn't matter how much the girls come onto him or try to get him to accept them, he refuses even with his girlfriend's permission. The author want him to be some kind of weird moron that wants to treasure just one girl even though he likes all of them. A no-balls b*tch is pretty much what the mc amounts to.
But if that was all, it would still be more acceptable, it's just that I'm starting to skip all the parts where the mc talks with or about the vampire girl. It disgusts me. They're making out and flirting to the point where it's just repulsive. F*cking like bunnies and the author has to rub it in our faces that they love eachother so damn much all the time. It gets old quickly. We understood that they love eachother a lot at the very start, but she becomes an eyesore after the same thing is repeated over and over again all while the other girls, many of who are both more interesting, more hot and more preferable are left hanging. They just stare at the mc and the vampire girl having sex and making out everywhere and screams about how unfair it is and how annoyed they are, all while trying to get into his pants.
Not only is this just ridiculously, incredibly unrealistic and illogical(which girls would bear being able to see the man they love act like that with someone else all the time? Also, they're treated like shit compared to her, so just how f*cked up in the head must they be to keep on trying to get into his pants and becoming his wives?), it's also frustrating. We have all of these girls that we like more than the vampire girl but she's the only one who gets attention even though she's the most boring of them all, being someone of few words and who just mindlessly does everything the mc wants her to without caring about anything, she would go along with everything he wants to, she seriously doesn't have any real opinions of her own. Someone who is that pathetically dependant on the mc isn't really interesting as a heroine, especially not when better choices are throwing themselves at him.
So, the worst part of it all is the disgustingly bad romance. Without that, this would be far better in my mind. The author needs to get his head out of his a*s and realize that making the mc solely devoted to only one girl while several other girls are throwing themselves at him is just annoying for everyone reading this. Either make it a proper harem without him being so devoted to one person without budging until the end or make it a proper monogamy romance where the mc just travels with this one girl in love with him, not several.
6.5/10, -3 points for the romance and -0.5 points because the "enemy" characters and their motivations are generally juvenile and stupid.