You're in class 1-A and are currently fighting the League of Villains.

Toga somehow gets to you and shoves a blade right through your heart, and you start coughing up blood and fall to the ground.

All the pros and classmates of yours look shocked... but only when you stand back up and rip the blade out of your heart perfectly fine.

Shigaraki: What the actual fuck...

Toga: That can't be possible...

Everyone is shook to the core because you never told them what your quirk was.