Kuroshitsuji Recap

Watch order for Kuroshitsuji.

All the explanations are also in the descriptions but to sum it up:
Due to being caught up to the manga, first season of Kuroshitsuji had an original non-canon ending, which then was followed into the second season: Kuroshitsuji II.

Few years after those came out, we got "Book of Circus" which completely ignored all of the anime-only content from the previous two seasons, and instead simply adapted the manga arc that happens right after episodes 13-15 in Kuroshitsuji.

Because of all this mess you now get a choice of skipping the non-canon episodes and only watching those that were adapted from the manga. Whether you /should/ do that is all up to you. People generally prefer the manga adaptations, but Kuroshitsuji II also has a fair share of fans and introduces new characters that some people like.

Anime Set In Great Britain 2: https://myanimelist.net/stacks/36936

One of my favorite anime tropes!

I love anime that feature what is normally a "background" character that is the perfect butler or concierge. They're good at seemingly everything - cleaning, cooking, mending ... you name it, so the master never has to worry. Oh and if things get dicey, it turns out the Butler is also secretly (or not secretly) Overpowered and has amazing martial arts or magical powers.

You know that butler! You might have seen them in these anime, sorted in Alphabetical Order.

Circus? Murder? A straight-forward list of the series that comprise the "Kuroshitsuji" anime, including both manga adaptations and anime-original material.

Following the anime continuity is weird