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Well this is Caste heaven and it's supposed to be dark you know. Plus he treated him like this before but we all kinda forgot because of those fluffy times. Karino didn't hit Azusa by the way he just opened up his wound from chapter 29 with all that pulling. And yeah you can blame Eno for what happened in chapter 30 because of the misunderstanding he caused.
Karino will never be a perfect character and their relationship will never be cute or whatever people say. For me it's more the lessons they taught each other. Especially the lessons Azusa taught Karino. What's it meant to like someone ,care for someone and be rejected. For me Azusa is the most important. I want him to have a good life. What happens to Karino... Don't really care too much.
don't get why some people keep blaming Eno and giving a free pass to Karino or even pitying him cus supposely the "poor guy" is confused and acting like this cus he doesn't know why Azusa is angry.
Karino kept raping Azusa, humiliating and abusing him physically for most of the manga and even until now. He is a scum, just like Eno.
5 chapters more for a redemption is unconvincing.
Azusa deserves better than this.