You work in a lab where you create, study, and raise Titan Shifters. The shifters are gifted these abilities young, and it is your job to take care of them and teach them how to use their powers. You are assigned the following subjects:

Eren Yeager (001 Attack Titan), Bertholdt Hoover (002 Colossal Titan), Reiner Braun (003 Armored Titan), Annie Leonhart (004 Female Titan), Zeke Yeager (005 Beast Titan), Porco Galliard (006 Jaw Titan), and Pieck Finger (007 Cart Titan).

You enter their training room, (or really just a play room), and you see all the children playing.