The narrative takes place in December 2199, a time when the streets buzz with anticipation for the year's end and the beginning of the next. Amidst the festivities, rumors circulate that Ragna the Bloodedge, an SS-class rebel carrying the highest bounty ever issued, has surfaced in the 13th Hierarchical City of Kagutsuchi. Ragna, also known as the "Grim Reaper," apparently aims to dismantle the system that controls the world. Drawn by the reward, a diverse group of unmatched fighters gathers in Kagutsuchi to claim the bounty.