@All-is-fine
It depends. Usually what is called Oni is associated with demons, but more like Ogres/Trolls type. Think demons with brute strength
I think the more common name in Japanese for devil/demon is Yōkai. It is used for demons/devils in general i believe if my beginner level Jap is not rustier than a thirty years old bucket.
Akuma is commonly translated as devil/demon too but is more associated with fire type demons/spirits if you look at it.
Ugh! As of chapter 53 I've endured as much as I can of this blatantly stupid story. Reading this makes me feel like my mind is turning into mealy mush so I wonder how I'd feel after reading another hundred, let alone a hundred forty or fifty chapters.
Bro is this the same protagonist since the beginning? I swear his hair is different, he looks more muscular, and he's less hesitant about certain things. The is a whole different MC.