Overlord is about a salary man who got isekai'd to the game he was playing as he became the character in his game, Momonga (later Ainz Ooal Gown). If this sounds familiar to you then it's because it's the same plot as Sword Art Online which created a sub genre in the isekai category. There, in the new world, Ainz started to build his own kingdom with the help of his overpowered minions and ingame items that became real in the new world.
Overlord started out as a fun isekai anime as we see Ainz who was a salary man struggle to lead and manage his followers as well as try to learn about the new world. We see the usual humor that is a staple of anime. I liked the world building, history and politics. There was so much lore about the new world and it seems it's not just Ainz who was transported. There were other players before him that were transported centuries (in the new world timeline) before.
However, as the series unfolds, it became apparent to me that the protagonist is evil. It's not a new concept as we see this in Dungeon and Dragons' Raistlin or Deathnote's Kira--it's just not common. The MC is justified in his actions for the survival of his guild but it harms the residents of the new world. In season 3 of the anime, there was no doubt that the MC is immoral after we saw the fate of Foresight and other adventurers who were lured into Nazarick. Sure, in season 2 the leaders of the Eight Fingers were tortured but they're criminals so it was kinda fine 😅
In episode 11 we saw the massacre in Katze Plains that even his allies feared Ainz. In the light novel, it's implied that Demiurge conducts human experiments and harvest human skin on live subjects to be used as scrolls.
The Sacred Kingdom showing in November 8 is based on the twelfth light novel, "The Paladin of the Holy Kingdom". It's about the human nation Roble Holy Kingdom led by its queen Calca Bessarez with the support of her friends Kelart and Remedios Custodio. They seek the aid of Ainz after their kingdom was attacked by the Demon Emperor, Jaldabaoth who is actually Demiurge in disguise. What follows is the destuction of the Roble Kingdom worse than the massacre in Katze Plains.
I've been following Overlord for years since it came out and I'm looking forward to this one. I'm kinda used to Ainz, the evil protagonist but sometimes I'm frustrated by how clueless he is. He's already the most powerful godlike being in the new world--his minions outmatch even the Slane Theocracy's trump card, the Godkin. Yet he prefers to conquer via stealth by placing spies and sometimes trying to use diplomacy or disguising as the hero adventurer Momon. He can just go and use force the way Demiurge attacked Roble Holy Kingdom. I'm guessing or hoping that there will be someone powerful enough to oppose him in the future and put an end to his evil.