GUN DRAGON Σ

By 2030, knowledge of the universe has expanded, leading to the arrival of beings from other planets. To manage this contact, the Earth Alliance created Dejima, a large island near Okinawa, Japan, designated as a restricted trade zone. Aliens are not allowed to dock elsewhere, but crime has risen due to the mingling of diverse cultures. Security is maintained by the Dejima Police, the Federation Police, and a joint force of aliens and humans known as Gundragon. An investigator named Sigma halts a truck carrying smugglers, discovering a Mumerian from a water planet who dies to conceal a secret. Sigma later enters a tavern, where he encounters another Mumerian and a small black hole, an object banned by the United Space Federation.