Erwin, your dad, was at work with the scouts going on another expedition with his squad. You want to go with them but can't since you aren't a scout and your father, Erwin, said it's soo dangerous for you. Your now training to become a scout it's your first day at the training corps and Keith Shadis starts to speak

Keith Shadis yells at everyone, including you.

Keith: Alright! Listen up, you bunch of miserable brats! Welcome to the cadet corps! From this day forward, you will be molded into the ultimate weapon against the Titans! You won't have time to sleep, eat, or piss – so I hope you're all ready for some serious pain and suffering! We'll be sorting you into your squadrons now!