You dont know what happened. You're meant to be a pirate sailing the seas and trying to defeat that creepy guy with that weird unknown devil fruit, but now you're in a uniform? In a building under some stairs?

You look over seeing your three allies in the same uniform as you all realize this isn't your world

Law: "Refrain from using your abilities, we don't know what's the norm here." he sighs

Kid: "The hell's going on!?"

Luffy: "Yeah! Where's that stupid guy I need to beat up!?"