A Most Unlikely Assassin

Would you believe I never killed anyone in my life? It sounds strange, I know. Downright odd really. Yet time warps all things after death, legends included. Now I'm trapped in a war I want nothing to do with, stuck in the worst Class possible, and partnered with a Master who may or may not kill me before it ends. A Most Unlikely Assassin indeed! Why me! Fate Zero. Narutoxharem!