This is a world surrounded by darkness. Strong and weak are the only scales that can distinguish the differences between people. The strong is king, while the weak can only be weak and be bullied by the strong all their lives. In this world, the national government exists in name only. They are the weak and are forced to work for the underworld. They are forced to give up a large part of their countries' land and give it to the underworld as a gift for peace and war. As a result, the people in the underworld's territory are oppressed and enslaved. The people there long for light and want to leave this place, but does the light really exist? Yes, it exists. Governments of various countries have used their own actions to tell people that light exists in the world: In 2034 AD, national governments secretly selected the best elite members from their own countries and asked them to gather together to become spies in the underworld and serve the national government at any time... This activity was named "Drug Smuggling"...