Our Last Crusade or the Rise of a New World

Our Last Crusade or the Rise of a New World (Japanese: キミと僕の最後の戦場、あるいは世界が始まる聖戦, Hepburn: Kimi to Boku no Saigo no Senjō, Aruiwa Sekai ga Hajimaru Seisen), abbreviated as KimiSen (キミ戦), is a Japanese light novel series written by Kei Sazane and illustrated by Ao Nekonabe. Fujimi Shobo, under Kadokawa Corporation, has published sixteen volumes and three short story collections since May 2017 under their Fujimi Fantasia Bunko label.

Source: Wikipedia — Our Last Crusade or the Rise of a New World (CC BY-SA 4.0)