Kill. Consume. Survive.  Ren Kageyama was reincarnated into a new world with nothing but the clothes on his back. After years of struggle, he stumbles across an ancient and deadly weapon - the sword of one-thousand teeth, Stigma. After touching it he is bound together with the spirit who inhabits the blade and pressed into servitude. If he wishes to prevent his soul from being eaten - he must satiate her hunger by destroying powerful enemies and consuming them. With a blade held to his neck and knights of order pursuing him relentlessly, he must survive in a harsh world and gather strong allies. Will he be able to become the strongest warrior in the world?