This is one of the best novels shown on this site, and easily my favourite novel. The plot is interesting, the world is fleshed out and well designed, the characters are interesting and unique.
There are a few things that can turn people away, these are not concerns for me, but may be of concern to some of you who are looking through the comments to get our opinion of the story, so I am going to try to be as unbiased as possible.
Firstly, yes there is a harem, a large one, yet unlike other harem novels, the characters are unique, all have their interesting personality quirks, and are memorable. Also, this isn't a "Every single female character falls in love with the MC", just a lot of them. There are still plenty of female characters who are interested in other people.
Secondly, the MC's power level. Let me get this straight, He is op, but not overwhelmingly so from the beginning. If you read the Synopsis and notice the words "death magic" and "enormous mana pool." You would come to the conclusion that the MC is op as balls from the start. You would be incorrect. True, if he had, for instance, fire magic, he probably would be op, capable of annihilating large cities with ease. But he has death magic, which has very little in terms of offensive ability. At most he can kill bugs or germs, create golems and weak undead (about as dangerous as a racoon). Death magic has a lot of benefits for "home life, " raising minions, buffing allies and minions, and some defensive spells, but nothing for offence, aside from being able to use poison and disease. At least, not for the first few books. Don't get me wrong, he is strong in many ways, and can do things that nobody else can, but, at least at the start, he is not "op." (in the later chapters he is VERY strong.)
Next is the Mc's personality. A lot of people don't understand his personality, A certain event, Explained in spoiler tab below, combined with his shitty past lives, results in him..... going insane. Yes, the MC is insane, but not in the ways you are thinking. He doesn't run around massacring people, even when we readers expect him to. (also explained in spoiler tab. Instead what he does is fixate on people/things/concepts. Let me put it this way, when a person in most novels gets strong, and someone is a d*ck to them, often a fight ensues, and the as*hole is killed. This MC would not do that, he even gets cheated out of some money, and forgets about the incident soon after. However, don't mistake him to be "naive." If he decides to kill somebody, regardless of who it is, or their background, then there is nothing you can do to persuade him otherwise. Whether that person is an emperor, noble, adventurer, hero, criminal or s*ave, if he decides you deserve to die, then he will work towards killing you. A certain incident (again, spoiler tab), often makes people think he is a "typical kind Japanese protagonist." I will tell you this now, nobody who walks down the path of being a Cosmic horror is a "typical kind MC."
Spoiler
Ok, the incident in question is basically at the start of the story. He, a Dhampir, is born in a nation that hates vampires. His mother is ratted out by villagers, captured by adventurers and vampire hunters, and is tortured and burned to death. He escapes, returning a few months later. The adventurers and Vampire hunters are way too strong for him, and have left, leaving the villagers who ratted his mother out. The hunters who ratted her out were killed, and the villagers who stood there and watched and cheered on the spectacle were punished.
Now most people expected him to massacre the entire village in vengeance, instead he didn't kill any of them (again, aside from the hunters who personally ratted out his mother). Instead, he turned the mayor's house, the Adventurer's guild building, the defensive wall around the town, and the fields growing crops and fruit for wine (the towns main export) into golems, and made them all run away from the town. Now, most people view this as too kind, but I love this vengeance. I am so bored of MC's simplifying their vengeance by killing everyone. This vengeance set the village back decades. The wall had to be rebuilt to protect the town from monster attacks, the mayor had to wait for it to be rebuilt to start rebuilding his house, the crops for the year were mostly ruined, and the orchards would take years to regain. He also spoiled all the wine in the village, and killed all the bacteria that would help ferment the alcohol, so that also would take a long time to fix. As the final nail in the coffin, the mayor was about to be promoted for helping end a "dangerous Dhampir." That promotion was canceled. All in all, I found it to be one of the most satisfying acts of revenge I ever seen, in books, movies or manga.
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