I don't remember the main character's name. But I know that he has a Butler who's name is montasir or something. The story starts with a guy from our world reading a story about a world that is being invaded by monsters. The guy then get transmigrated to that world but he couldn't fight against the main character's soul so he gets devoured. And so the main character knows the future. That's the begining and don't remember anything else
Also the main character is the villain of the story from the book
Also the main character is the villain of the story from the book