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well, if we want ethical anime studio then kyoani or orange (or really any 3d cg studio). but those aren't really suited for this manga ╥﹏╥ also kyoani has its own publishing studio so they prioritize in-house works
maybe... the most suitable one out of the ethical studio is orange since beastars also has darker theme and the studio is flexible enough to tweak their style (kyoani with dark anime when)
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my god it was a joke. im well aware of their current situation, and there are a ton of other studios who can handle works like this one extremely well, not just wit and mappa (although for the love of god i hope Pierrot doesn't touch any popular manga again). i really love mappa though, but they're already having a lot of projects as we speak, and my little comment won't make any difference..
I REPEAT. THIS WOULD MAKE A SICK HORROR ANIME. I REPEAT. MAPPA HEAR US OUT