I quit reading this after chapter 43 I think it was (whenever the little brother came in her room) - after that chapter I looked up what would happen during the Arc (since its Korean I think and this Arc is completed, just isn't up in english) and I was sure that Kazuya would man the fuck up and do something.. which he doesn't ... if anyone knows what will happen during this Arc then thats basically why I quit reading, serious I know Kazuya is a bitch but common... after he gets his ass beat by the little brother he doesn't do crap..
I don't mind 'weak' protagonists, however Kazuya is pathetic, no wonder they made it into a anime, they needed to bring fans in after people dropped it after this Arc.
You would never see any male protagonist act the way he does in this situation, hell you'd never see a real guy act like it either - its a let down.. and for me a deal breaker.