Ultraman Universe: Ryan's Panel Legend

Lin Yu, an Earthling, transmigrated to the Ultraman universe and took over the body of the Red Tribe prodigy Rean, who had died in the Great Ultra War. He also unexpectedly activated a game interface. By killing monsters, he leveled up and grew stronger. By the time the war ended, he had become a legendary figure of the Land of Light, leaving all the Ultras in awe.