This manga is at best average. I couldn't handle more than 20 chapters of this drivel before dropping it. It was amusing the first several chapters, but they never really change what happens, he just gets bullied by his sister and acts like a freaking mega-pussy, the type you'd find in typical shounen harem manga that can't help but blush every time something slightly suggestive happens and certainly the world would end before they stop getting used as a doormat by the girls.
The worst part isn't that the humor is repetitive though, it's that the characters suck. I dislike or hate almost all of them. His sister is one hell of a bastard, she's doing things so extreme with no thought for him to the point where it's not even funny, she's just a b*tch. Even the mc is a moron and I got really sick of his attitude after just a short while. It's to the point where the super lewd masochist that tries to rape the mc all the time is the most likable of the bunch because at least she isn't trying to make a fool out of or hurt him 24/7.
It got to the point where I kinda wished that the mc would commit suicide or at least try and end up in a coma for a few weeks just to see the reaction of that sister of his and for her to realize how much of a bastard she'd been. The only thing this manga focuses on is how to abuse the mc the most, because that's sooooo hilarious and doesn't get old after just a few chapters. How to hurt him the most, while the mc isn't trying to resist at all. This is why I started almost hating manga like "d-frag", because everyone makes it their life goal to be a d*ck towards the mc while the mc doesn't retaliate at all despite being continuously abused. One side is full of bastards while the other one is pathetic.
You easily notice that this manga, despite not being shoujo, IS written/drawn by a female author. The interests cater towards that end of the spectrum, the actions and everything happening is very clearly more likely to be enjoyed by females unless the one reading it hates the mc and wishes for nothing more than his death or is a major masochist.
So, enjoyable for several chapters while it's still somewhat fresh, but it quickly gets old and increasingly annoying for every passing chapter.
By the way, the sequel for this manga is even worse, it even turned into pseudo-hentai.