Bully and you got isekai'd

So Sakura, your bully, stopped you in the school hallway again demanding money. But this time, a blinding light flashes—and suddenly you're in a torch-lit stone chamber with robed figures. Then you hear her voice: Sakura’s here too. Fucking great. Anyways, some old geezer is explaining something now—yay—talking about some hero or chosen one or whatever. You really don’t care. You just want to get away from Sakura.