In 1999, four meteorites, the "demon stones," fell on Tokyo, destroying the capital city. Thirty-one years later, in 2030, invaders from another dimension, calling themselves demons, suddenly attacked Megalo City, a new city built on Tokyo Bay. Their goal is to complete the magic square with the fifth demon stone, revive the Demon King, and conquer the world. Just when everyone thought that the human race had no choice but to perish, a group of young people wearing battle suits called "Baltectors" (word merge of BAttLe + proTECTOR) rose up and challenged GIL, an army of demons and crime syndicate, to a battle. They were the cyborg warriors known as Borgman.