I really hope that girl isn't just yet another psycho man-hating lesbian character. Or if she is, I hope future chapters will make her character somewhat more likeable.
Baka to Test made me grow tired of that kind of archetype.
Gonna be honest, I hope there's no training arc because those really fucking suck and he's already doing the rooftop stuff with Hanako, so the ex-friend's sister can return to the pit of Hell that spawned her.
Okay, so instead of a psycho lesbian with unusual strength she's just a self-declared rival muscule head.
That's an improvement, I say. Not much, but in this manga you can count the truly evil and unlikeable people with one hand.
I think that this girl is not that bad, despite how zealous she is about fighting.