There's a good deal I like about this series. It presents an intriguing set of characters that get more interesting as the series progresses. It's got a visual style that really pops with a great deal of magical flair, and you can feel the weight of its fights. I also like the world-building and place-setting this series has done for its next season.
And that's the biggest knock I have against it: it does just seem like place-setting for the next season. It's not so much that this is a slow start - we start and finish several short arcs back-to-back over the course of this season, all of which have their own little intrigues as various mysteries are solved - but rather that the series seems just fine getting side-tracked as often as possible.
The first two episodes set up a central plotline for the series for us to follow: Guideau travels with Ashaf under the auspices of a larger magical organization to hunt down witches with the aim of finding a specific one that cursed her and ending her. She doesn't really know what the witch looks like (I initially thought this was a Dorohedoro situation where the lead just didn't know who his target was, but it's a little more complicated in this case), but she should be able to narrow the field, get the curse removed, and return to a powerful body that Ashaf carries around with him in a coffin similar to Wolfwood from Trigun. So, what I expected was to see them run into a series of witches, gathering clues and getting closer to their goal before having some big finale engagement. And... well, we kind of get that... if you ignore a couple of other short arcs in the middle.
To be fair, all the side-tracks the series takes are interesting in their own rights and do establish more of the rules and basic concepts of this world, particularly in who can use magic and how. In one particularly interesting aside, we follow a necromancer and get to see what a completely distinct type of magic can do. It's honestly some of my favorite stuff in the series.
But that's the problem: I don't think the central plot has gotten interesting. They've run into a few witches, dealt with a variety of magic, and bent the rules a bit with the curse so that we can see what Guideu's original form looks like. And yeah, it leads to some cool stuff. The problem is that I don't have much reason to get behind Guideau. I know next to nothing about her motivations beyond wanting her body back. Ashaf remains a bit of an enigma. Honestly, we get to know more of the side characters better than we do these two. And that's not necessarily a big deal, but there's also very little in the way of character growth for either of them, and even when we arrive at key climactic moments, they just don't have the emotional heft to make them feel terribly meaningful.
Finally, while I wanted to give this a higher score, it ended up being brought down a little by its final couple of episodes. The backstory helped establish a bit about their background together, which is nice, but it felt like an odd arc to leave us on. Combine that with an exposition dump from Ashaf that sets up some very interesting bits of worldbuilding that I'm legitimately excited to see in S2 and, honestly, it made the ending feel like more of a tease for S2 than anything meaningful to this season.
Still, I enjoyed the ride. I want to see more of these characters and learn more about them. I just wish they'd focused their efforts better in this season.