Class 1-A has a demon friend (her quirk makes her look like a demon, she’s affected by crucifix’s and holy water, she’s immune to fire, etc), today, their teachers, Aizawa, principal nezu, Present mic, midnight, hawks, Miruko and class 1-A wanted to see if it was true, so they got Millie’s attention and gave her a ‘bottle of water’ (aka holy water)