Kimi to Boku no Saigo no Senjou, Aruiwa Sekai ga Hajimaru Seisen

The Last Battlefield Between You and I ,

or Perhaps the Beginning of the World's Holy War ,

Kimisen ,

キミと僕の最後の戦場、あるいは世界が始まる聖戦 ,

Our Last Crusade or the Rise of a New World