This book was first put on the web it seems :|
So for the first 80% of the book you only really get tiny little snippets of the blatant misogyny that gets dropped in the last 20% of the book. That is if you can get past the whole onii-san in love with imouto-chan and it does say they are blood related so this isn't one of the step sibling situations you see in most ecchi and hentai stories.
What's interesting is this book remarks upon how short the skirts are. It isn't the first thing I've seen to do this, but is it really lost on the author that it's the author/creator that made the skirts short in the first place. It's also men in the real life that impose a uniform mandate of skirts on to women because it's "appropriate feminine attire"?

In this book this is what happens:
Tatsuya goes to school
He meets some girls that are now his harem
He joins the student council as an enforcer
He stops a fight

The rest is getting from point A->B and sticking in stuff like seeing his sister in her underclothes and perving while not perving over her. Basically the author pervs over her but Tatsuya is the "strong will of iron"
So the first part of this book is basically one big info dump about psions, CADs and how magic works interspersed with getting from A-> B. The latter part is sexually degrading all the female characters and having Tatsuya play hero to save all of them and humiliating them and garbage. With an ending that just...ends. This book is basically a steaming pile. But not SO bad as that Kensha book. ( )