There's a lot I didn't get like what they meant by the future plan of shukizaki kiki and falsifying history but I wasn't all that interested anyway. The finale was really really cool,one of the best I've seen though I didn't like the ending really. They should have all died it would have been poetic.
Overall if there's one thing I really liked about this show was how it felt like every episode from start to finish felt like it was planned out long before even one of them aired. Each episode was it's own story and well contained and served it's purpose for the coming plot.
What I didn't like was the story getting slow and boring at points with relentless exposition and 30 min talking and planning for a 1 min fight.