Ouga Shiraga, a newly crowned professional wrestling champion, returns to his remote home island only to find it under siege by a terrifying extraterrestrial swarm. With his fellow islanders missing and the peaceful landscape transformed into a battlefield, Ouga makes a choice: he will defend his home using the only weapon he possesses—his training. Trading the canvas ring for a desperate survival arena, the champion unleashes his raw power. The fight for humanity begins now, as Ouga proves that even aliens are no match for a true master of the squared circle.