all the people saying that hori is abusive, clearly haven't been reading this manga at all (or lack reading comprehension). but it's been clear from the beginning that hori has trouble expressing herself in words, and resorts to screaming or hitting when she can't find the right words, and the people who love her understand that, miyamura especially. he even finds that fighting is a way for people to express how close people are with one another. he can also protect himself, just because the dude is skinny, it doesn't mean that he isn't strong (he headbutted sengoku, and beat up toru remember?).
so yes while domestic abuse in real life is absolutely terrible, and need to be taken seriously, we also need to understand that this is clearly not domestic abuse.
edit: also, the original webcomic this was based on was hella dark so this is extremely light compared to that.