How do I find a decent way to start playing this game?

it barely even explains what they lucavi are and it doesn't get into where they came from at all. The only context it gives it the politics of the time and the fake legend.

They're evil demons posing as saviors. That's all you need to know.

They're evil because they're just evil isn't good writing for a villain that is behind the entire story in one way or another. The reason they are the way they are is important, and only explained in 12.

>a villain that is behind the entire story in one way or another
Congrats for failing to understand a game made for children.