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 fifteen volumes and three short story collections since May 2017 under their Fujimi Fantasia Bunko label. A manga adaptation by Okama was serialized in Hakusensha's Young Animal magazine from May 2018 to March 2021. Both the light novel and manga are licensed in North America by Yen Press. An anime television series adaptation by Silver Link aired from October to December 2020. A second season by Silver Link and Studio Palette premiered in July 2024.