Translation logical, typesetting neat, no typos noticed- good chapter tl-wise. Thanks for the work!
Edit: Also credits page that shows some effort put into it, which is nice
Theory(i do NOT read raws nor spoilers, so it's my own genuine guess)- Zekes poison can potentially harm demons in their infancy, maybe something with interrupting natural demonic developement of fetus or whatever. That's why he left. As i said it's my guess, nothing backs it up
Thanks for the update! Nothing wrong with translation(meaning no typos or logic errors, i wouldn't know if the translation itself is flawed since i don't know japanese, nor seen raws)