Zero vs Kira by Crossover Maniac is a Code Geass and Death Note crossover where Light Yagami is teleported to the Code Geass world when a Britannian world-breaching experiment Goes Horribly Right. Furious that the Britannians tried to kill him and enslaved his country, Light introduces the power of Kira to the Code Geass world when he declares war on Britannia. Also seeing no immediate way of returning home feels he may as well create the New World he envisions here. Meanwhile, Kira's activities have put a Spanner in the Works for resident Magnificent Bastard Lelouch's plans and as Zero he intends to do everything in his power to bring Kira down...