How is it hentai? Sure, the girls are supposed to be teenagers and some of the outfits are a bit skimpy, but it's hardly perverted, unless you associated anything with Japanese anime/that style with hentai, in which case nothing I can say will change your mind. I haven't played the game, but it looks like fun.
Why is it so many people complain about sexualised girls in games like it's only for perverts and sexist men? I suppose these people think games with violent killing are only for psychopaths? Goes to show how f-d up our society is that we love shooting people but get all offended or put off games basically because of boobs. Grow up.
Back on topic, I wouldn't recommend Skullgirls on PC unless you're a casual fighter gamer and plan to stay that way. There is no high level fighting community on PC but there are plenty of scrubs and cheaters. It's gonna be a while before any PC fighter is worth playing for good players who want good competition.