I liked Macht and Solitar. Solitar's end was pretty lackluster to me, but Macht's (being the main antagonist of this arc) was satisfying enough. And I liked Macht more than Solitar so I'm good. Interesting demons. I also really like the bits and pieces we got about the Demon King in this arc; I still think we'll get to see him at the climax of the story. There might be a reason why his castle is close to Aureole.
My opinion on Denken hasn't raised much, but I appreciate the development of his character here. The flashbacks to his past throughout the arc was really nice; that panel of him by the grave touched me.
If there's a season 2, I see this chapter as the last chapter of the first cour. I can already imagine the credits rolling and the added anime original scenes.