Assassins Creed System

Someone died and was reincarnated with the Assassins Creed System. He remembers his past life yet doesn't know his name or the name of those he once knew. All he knows was that he was a shut in who became apathetic to the world and his favourite game of all time was assassins creed. Reborn in a world he knows as Naruto, will he change the future or go with the flow?