In "MultiEarth Α0073", which has entered an era of cosmic coexistence, crimes involving the exploitation of energy-based lifeforms known as "Emorgy" are breaking out one after another. Reiji Doki, an investigator for the Galaxy Federal Police, is Gavan Infinity—the only one in the cosmos permitted to bear the title "Space Sheriff Gavan." Yet he is assigned to the marginalized Archives Division, where he endures constant ridicule from detectives in the First Investigative Division. Few know his true mission: investigating trans-dimensional Emorgear crimes.