World scale and world building. We have other continents, flying lands etc, but whole story in small corner of the world, Roland early in the game stronger than all human kingdoms combined and demons popping out just from nowhere. I would have prefer some more diversity in human civilization, witches usage etc, or more about other races. But whole novel is about standoff between humans and devils.

I'm so tired of Nightingale's feelings being dumped into a garbage fire every time. The story isn't really a harem; there's only two interests that Roland has feelings for. Unfortunately he isn't willing to pursue only one woman and that really leaves poor Nightingale in the doghouse for at least like 600 chapters (I will not be finishing at this point so I don't really know if it gets resolved). I think initially the polygamous relationship was actually being approached fairly well, Roland and Nightingale were on the same page and Roland discussed it with Anna so everything was above the board. Unfortunately it just stops there, Anna says she'll deal with it (?) and then has a secret conversation with Nightingale that the readers dont get to hear (It's implied the whole time if not outright stated that she was okay with it on some level) and the issue is just never mentioned again other than hundreds of chapters later there's like one sentence about how Roland remembers he never found out what all that was about but then he gives up.

So what happened? There's a multi year gap where nothing happens between Roland and Nightingale other than him like taking a glance at her thighs, did they both forget all their feelings or did the author? To make matters worse early on in the novel Anna tries to sleep with Roland before their relationship was official because she was afraid that in these dangerous times one of them might die and it would be s*upid to not share their feelings now and regret it later. DESPITE this Anna, who supposedly accepts Roland and Nightengale isn't willing to give Nightingale the same courtesy despite the fact that the latter is literally in even more dangerous situations on the front line with even more dangerous enemies than ever before. It just seems hypocritical to me.

I do have a soft spot for Nightingale, compared to the milk toast Anna. I mean Anna is great and all but she always kind of seems like a flatter character. She's got the strongest magic than all the other witches, she's smarter than all the witches, she's the most important manufacturer of all the witches, but despite that she's kind of boring and doesn't get a whole lot of screen time considering her supposed importance. I think Lightning and Maggie are on screen more than her.

Anyway romance rant is over

Making the second witch collected able to heal all but the dead might have been a tad bit overpowered, though I guess looking at Anna she's not much better in that regard

Also it doesn't sound like it but I swear I don't really hate Anna

There is an enemy in his "dreamworld" who he spot pretty easily but despite the obvious clues, he still has some doubt and while it is extremely dangerous to let her stay here, he does it without even monitoring her. Also, I hate it when a character resurrect, death should be permanent or you lose the suspense.

The "King" of the "Kingdom of Graycastle" suddenly announced that the heir of the kingdom will be decided, not by line of succession, but by whichever candidate can best administer the town/city they are assigned to.

The contenders are: Militaristic First Prince "Gerald, " Scheming Second Prince "Timothy, " Strategic Third Princess "Garcia, " Decadent Fourth Prince "Roland, " and Intelligent Fifth Princess "Tilly."

While Gerald is dissatisfied by the "King's" decision and Timothy is scheming against Gerald, Garcia set an assassination plot against her three brothers involving poison. Two out of the three attempts were nipped in the bud while the third attempt against Prince Roland was seemingly successful.

Enter "Cheng Yan, " a nerdy jack-of-all-trades (knowledge-wise) engineer, who apparently dies due to heart failure from being overworked. Cheng Yan's soul then proceeds to be dragged through time and space in order to be stuffed into the newly deceased/vacant body of Prince Roland.

"Roland (aka Cheng Yan) " awakens from his "stupor" and realizes that he is at a medieval witch burning event. Cheng Yan, who knows the history of the absurd witch hunts from Earth, delays the sentencing and later frees the "witch" by burning another woman of similar body shape after she proves to him that magic is indeed real.

After the battle against the church, in which Zero lost all her memories and lifespan to Roland in the battle of souls, Roland is now basically immortal (Because Zero even absorbed demons who supposedly live to become stronger forever) and has full access to any knowledge he has memories of via the dream world.

The civilization prior to the four kingdoms had witches placed as upper class citizens and common people as low-level workers or even as s*aves. Once the two wars against the demons resulted in pushing humanity into the corner that became the four kingdoms, the common people, who vastly outnumbered the witches, turned on them. Thus the church order that aggressively hunted witches was established.

The arrogant attitude of witches, who had in-born power, over the common mortals eventually resulted in backlash aka rebellion.

I could tell that Roland and the witches didn't learn a thing from history. The witches, combat ones in particular, can already be seen as becoming arrogant due to the safety Roland's domain provided because they no longer had the church to fear. This is honestly just a big turnoff for me.