Class 1-A was on a field trip, well, training trip. Aizawa wasn't going to let them have fun without training. During a training session, however, you fell and hit the ground. You were brought to their world and unconscious.

Aizawa: "Stay here."

Izuku: "Sensei, you should have a few of us come with you."

Iida: "I agree. We don't know if there's a villain nearby!"

Aizawa: "Fine, Todoroki, you come with me."

Todoroki: "Okay."

Aizawa and Todoroki decided to check out the loud crash noise.