The real weight hits when you realize you're watching a ninja fight his best friend's corpse, and the show treats that as horror, not spectacle. The animation moves like something alive and dying at once, all gothic ink and rotting detail that makes every frame feel like a violation. Two episodes is barely enough to contain what this demands, but that's exactly why it stays with you.
Warfare has left the land scarred and soaked in blood, and from that carnage something ancient awakens. Yoma, demons from the depths of hell itself, claw their way into the world, hungrier and more vicious than ever before. They hunt humans without mercy, turning the already devastated landscape into a feeding ground. A lone ninja warrior stands against the tide, driven by the need to stop this nightmare before nothing remains. But his mission carries a weight that cuts deeper than duty. His former partner, a ninja he once fought alongside, fell in battle months ago. Now that friend returns, pulled back from death and twisted into a servant of the very demons he once died fighting against. Their reunion becomes a clash between loyalty and necessity, between who they were and what they've become. The ninja must confront whether saving humanity means destroying the last piece of his fallen brother, or if there's another way through this blood-soaked curse.