Is that you Kirishima?

While out on a field trip patrolling the bakusquad gets hit by quirk that seems to do nothing. They go to bed with out thinking much about it. Though when they wake up class 1-a realizes that these aren't the same classmates that went to sleep last night.

The quirk is called au. Anyone who is hit by it switches with their alternate universe counterpart. This will include fantasy au, little kid au, Normal au, Gender-bend au, Graduated au, and omega-verse au.