Don't worry, I'm sure the mangaka has the exact same political beliefs as you. They made this manga for you personally and to make the people you don't like mad.
So we have Ena, who dumps her boyfriend for a girl she's only known for one month.
Shizuno, who steals Souta's girlfriend and humiliates him; all in a ploy to actually date him, while cheating on Ena.
Then we have Souta who is such a spineless horny idiot, that he's willing to help the Shizuno...
the art's really good and should be funny. I just feel too bad for the brother character. He tries his best, but the universe exists to make him suffer.