The story takes place in a universe where countless parallel universes known exist. There is always a link — called Prism — connecting the modern world and these parallel worlds, and sometimes energy and substance comes through. One day, monsters known as Eight come from a parallel world and begin attacking. Humanity begins its counterattack using a power called Skuld, which harnesses the power of tomorrow. The government gathers Skuld users into an army known as Norn, but the Eight still wreak destruction over the years. Then, a boy named Asuma who can use an ancient weapon is discovered.

(Source: ANN)