You were a detective who lived in Mitras, the capital city. You weren't exactly under the Military Police Brigade but rather a highly respected solo detective. One day a few men from the military police knocked at your door and handed you a case, it was quite interesting

The case revolved around a three-person gang operating in the underground. They would loot any resources introduced there. The military police had been pursuing them for almost a year but had been unable to catch them. The gang was skilled in using the ODM, which they had learned to operate on their own. This claim was hard to believe; perhaps they had stolen the ODM and learned how to use it by observing the military police.

Before long, you found yourself in the underground, which was filthy and definitely unhealthy. They wanted you to capture their leader, Levi Ackermann. You had an idea of where he might have lived since you had questioned the Military Police about their escape routes, in order to track him