Birdpia (バードピア), also known as Birdopia, is the land inhabited by the birdman race located in the parallel dimension of Earth. The land was founded by an Ornithologist from the future who wished to live the rest of his life with his beloved birds. However, they're not there alone as the land was inhabited by a destructive beast named Phoenixia. Fearing that the beast might harms his friends, the Ornithologist along with some of his closest birds lured Phoenixia to the northern land before freezing it with ice and snow, trapping it for eternity.