The narrative takes place in December of 2199, when the streets are buzzing with excitement for the end of the year and the start of the next. Ragna the Bloodedge, an SS-class rebel with the greatest ever reward on his head, has emerged in the 13th Hierarchical City of Kagutsuchi, among the celebrations. Ragna's or the "Grim Reaper's" ostensible goal is to destroy the world-controlling system. To collect the prize, a slew of peerless fighters descended in Kagutsuchi.