What Now? Attack on Titan Fanfic

Eren Yeager, Mikasa Ackerman, and Armin Arlert just joined the military. Just before their first day, a bright light appears and they are brought to a mysterious room- but they're not alone. Along with them are some cadets in their class and a few people from the Survey Corps. Specifically Erwin, Levi, and his squad. They are then told that they would be watching a show called "Attack on Titan".

I know, this has been done loads of times, but I wanted to give it a shot. I'll try to make it a little different from others.