The discovery of Gaimetal, a highly energetically pure metal ore, was made in 2047, buried 50,000 meters (160,000 feet) below ground level, leading to global mining. However, in 2055, Gaist, lifeforms made of metal completely covered in Gaimetal, emerged and began assaulting human beings. In 2064, warriors such as Rekka, Hayato, Kurama, and Siren donned their Gaist Gear and confronted over 100 types of Gaist creatures.