Kei Sazane, the acclaimed author of the “Our Last Crusade or the Rise of a New World” (Kimi to Boku no Saigo no Senjō, Aruiwa Sekai ga Hajimaru Seisen) light novel series, announced on January 1, 2026, that the popular fantasy-romance saga is entering its “final battle.” This revelation, shared via his X/Twitter account, signals the approaching climax of the long-running series, much to the anticipation of its dedicated fanbase worldwide.
The Journey Towards the Climax
The “final battle” announcement indicates that the narrative arc of Iska, the Empire’s youngest and strongest knight, and Aliceliese Lou Nebulis IX, the “Ice Calamity Witch” princess of the Nebulis Sovereignty, is heading towards its ultimate resolution. Their star-crossed romance, set against a backdrop of a century-long war between a technologically advanced Empire and a magic-wielding “paradise of witches,” has captivated readers since the series’ inception.
A War-Torn World and Forbidden Love
The core of “Our Last Crusade or the Rise of a New World” lies in the seemingly irreconcilable conflict between two powerful nations. The Empire prides itself on scientific advancement, while the Nebulis Sovereignty harnesses formidable astral magic. Within this perpetual war, Iska and Aliceliese meet on the battlefield, initially as sworn enemies. Despite their allegiances, they develop a mutual respect and affection, both secretly desiring an end to the bloodshed. This forbidden love forms a central pillar of the story, exploring themes of prejudice, understanding, and the possibility of peace amidst deep-seated animosity.
Publication History and Global Reach
Kei Sazane, with illustrations by Ao Nekonabe, first launched the light novel series in May 2017 under Kadokawa Corporation’s Fujimi Fantasia Bunko imprint. As of October 2024, sixteen volumes and three short story collections have been published in Japan. Yen Press licenses both the light novels and their manga adaptation for North American audiences, making the series accessible to a broader international readership.
Adaptations Bringing the Story to Life
The popularity of the light novel series led to several adaptations, further expanding its reach and bringing Sazane’s rich world to new audiences.
Anime Television Series
The novels inspired an anime television series adaptation by Silver Link, with the first season airing from October to December 2020. A second season, a co-production between Silver Link and Studio Palette, began airing in July 2024 and concluded in June 2025. Crunchyroll streams the series, providing global access to the animated adaptation.
Manga Adaptation
A manga adaptation by Okama was serialized in Hakusensha’s Young Animal magazine from May 2018 to March 2021, compiling the story into seven volumes. This adaptation provided another visual interpretation of Iska and Alice’s story, complementing the original light novels.
What the ‘Final Battle’ Means for Fans
The announcement of the “final battle” suggests that the overarching conflict between the Empire and the Nebulis Sovereignty, and the personal struggles of its protagonists, are drawing to a close. For fans, this signifies that the series is moving towards its ultimate conclusion, promising answers to long-standing questions about the war, the fate of Iska and Aliceliese’s relationship, and the possibility of a new world born from their efforts.
Kei Sazane is also known for other works, including “Gods’ Games We Play” and “Hyouketsu Kyoukai no Eden,” showcasing his versatility within the fantasy and sci-fi genres. The impending “final battle” in “Our Last Crusade or the Rise of a New World” ensures that readers will be eagerly awaiting the concluding chapters of this epic tale.
