Troubleshooter: Abandoned Children is an adventure role-playing game with Japanese-style turn-based tactical combat. Valhalla is a free trade country built by three world powers for shared prosperity after a world war. In an attempt to control the citizens, three world powers banned the army from leaving Valhalla. Due to these circumstances, public order in Valhalla is always unstable, and therefore, ten years later, the government made a bold decision — now civilians have the right to investigate and arrest criminals in order to reduce the increase in crime in the region.