TL;DR: Worth a watch if you like Black Butler at all.
I also like to start ratings at 5/10 and go up or down from there.
Story: 8/10
All in all, this mystery was fun, engaging and I didn't not feel like it dragged on despite my initial thinking two one-hour episodes might be a bit long, particularly when the story seemed to be wrapping up halfway through the second episode. However, it still kept me interested but I could see how the ending might be a bit confusing for people who haven't seen Book of Circus.
There were a few scenes that made specific references to Book of Circus, particularly the main villain's "motive" (although it could still make sense, just might seem a bit random) as in Charles Grey acting on the Queen's orders to "punish Ciel for his mischief" and the end with the whole "Snake was there too" bit.
For the most part though, anyone who knows the general idea of Black Butler could enjoy this, it's not too short or long, and has an interesting enough storyline to keep you interested for the duration of it's just over two hours runtime. It also had a couple twists that were pretty good although I had read the manga in advance so they weren't really a surprise lol.
Art: 8/10
I really like the art style for Black Butler, and it looks the same and high quality for this. Sebastian being as classy looking as ever, although several scenes look a bit lazy. Specifically, where there were a number or people on-screen and you could only tell who was talking by seeing which mouth was moving because everything was static.
One other thing that kind of stood out to me was a specific scene; when Arthur comes back to confront Ciel and Sebastian about what really happened. When Ciel is on the staircase laughing, that looked really...fake and jarring to me, like his head didn't move at all but the rest of his body was, just looked rather rough compared to the rest which was pretty good looking.
Sound: 7/10
There are a few spots where classical/piano sounding music would play when Sebastian is either doing something really impressive etc and at the start and end. It sounded good, and like always, fit the victorian era theme of the anime.
Characters: 7/10
Nothing really remarkable or terrible. You understood the basics of each character and for the most part, their motives.
One thing I thought about which is probably due to the shorter runtime was there wasn't as much character interaction throughout, specifically at the beginning. They all had their roles (and some gimmicks) but I felt a few of the guests were just there to die(the quiet blond-haired dude who gets poisoned) and be props as the other characters progressed through the story (Grimsley the...Stage Director? and his lady friend the opera singer).
Enjoyment: 9/10
I'm a sucker for Black Butler and seeing my favourite all-powerful butler in action so this was a fun watch. The story was complicated and interesting enough to keep me invested, and wasn't too complicated that I felt lost. Gotta love Sebastian's heels (haha) and butlerisms.
Overall: 8/10
Not the best thing I've ever seen or something I would call a "masterpiece", but really good nonetheless. Worth a watch if you like Black Butler at all.
