Of the playable characters I have (around 10 or so), I've only had Paulette (the one posted in 1st page) flat out showing her boobs. And there's no defending her design. The other playable characters though are not that bad.
I can't find more SS online and I can't take manual screenshot atm.
I feel that it's a shame they design some of these characters like that, because the game actually does not really draw your attention to them apart from their portrait itself in the writing. There's no beach or bathhouse scene (or at least I'm aware of), things like that, so the few dumb designs really hurts the otherwise beautiful anime art style and shy away some potential customers.