Iska (イスカ, Isuka) Voiced by: Yūsuke Kobayashi (Japanese); Jason Liebrecht (English) The unofficial leader of the Heavenly Empire's 907th Unit and an unparalleled swordsman who wields the black and white colored astral swords that can negate most types of magic. At the age of 16, he was recognized as the youngest Saint Disciple in the Empire's history. However, for unexplained reasons, he freed a witch who was being held in an Imperial prison, resulting in him being stripped of his title and then imprisoned for a year as punishment. Now, the leaders of the Empire have given him another chance at freedom, provided he kills a certain purebred witch. However, Iska seeks to find a way to end the ongoing war without further bloodshed. Aliceliese Lou Nebulis IX (アリスリーゼ・ルー・ネブリス9世, Arisurīze rū Neburisu Kyūsei) Voiced by: Sora Amamiya (Japanese); Emily Neves (English) Aliceliese, or "Lady Alice," is the purebred "Ice Calamity Witch" with powerful ice-based magic that rivals most other astral mages in her homeland of the Nebulis Sovereignty. As a daughter of the Nebulis royal family, Alice is in line for the throne that Millavair, the current queen and her mother, holds. After running into Iska multiple times, she starts to develop feelings for him, and even makes an attempt to recruit him to her cause. Like Iska, she quietly seeks to end the war between the two countries without further bloodshed as well. However, these ideals raise tensions with her mother, who sees no path to peace with the Empire, even going as far as burning artwork in her personal room that was made within the Empire.
Jhin Syulargun (ジン・シュラルガン, Jin Shurarugan) Voiced by: Shun'ichi Toki (Japanese); Alejandro Saab (English) A skilled sharpshooter with the 907th Unit who usually speaks in a dry tone. Mismis Klass (ミスミス・クラス, Misumisu Kurasu) Voiced by: Nao Shiraki (Japanese); Lindsay Seidel (English) Captain of the 907th Unit. Despite looking like a child, acting like a klutz, and having low physical strength, she still provides moral support to her comrades in the Unit. Later on, she gets exposed to a star vortex and is branded as an astral mage. Though her powers are currently unknown, the rest of the Unit is forced to hide her brand lest she be experimented on by the Empire. Nene Alkastone (音々・アルカストーネ, Nene Arukasutōne) Voiced by: Kaori Ishihara (Japanese); Sarah Roach (English) A high-spirited field mechanic and weapons designer in the 907th Unit who creates and deploys anti-magic equipment during missions. Risya In Empire (璃洒・イン・エンパイア, Rurisha In Enpaia) Voiced by: Ayana Taketatsu (Japanese); Dani Chambers (English) The fifth seat of the Saint Disciples. Nameless (ネームレス, Nēmuresu) Voiced by: Jun Kasama (Japanese); Patrick Seitz (English) An assassin who is the eighth seat of the Saint Disciples. Shanorotte Gregory (シャノロッテ・グレゴリー, Shanorotte Guregorī) Voiced by: Ami Koshimizu (Japanese); Tia Ballard (English) The captain of the 104th Unit. She is a friend of Mismis. Emperor Yunmelngen (天帝ユンメルンゲン, Tentei Yunmerungen) Voiced by: Aoi Yūki (Japanese); Katelyn Barr (English) The emperor of the Empire. Johaim Leo Armadel (ヨハイム・レオ・アルマデル, Yohaimu Reo Arumaderu) Voiced by: Junya Enoki The first seat of the Saint Disciples. May (冥, Mei) Voiced by: Miyu Tomita The third seat of the Saint Disciples. Magnacasa Gunfight (マグナカッサ・ガンファイト, Magunakasa Ganfaito) Voiced by: Show Hayami The fourth seat of the Saint Disciples. Sir Karosos Newton (サー・カロッソス・ニュートン, Sā Karososu Nyūton) Voiced by: Tomokazu Sugita The tenth seat of the Saint Disciples. Garganly (ガルガンリィ, Garuganrii) Voiced by: Kazuyuki Okitsu The elevent…

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Our Last Crusade or the Rise of a New World is written by Kei Sazane and illustrated by Ao Nekonabe. The first light novel volume was published on May 20, 2017, by Fujimi Shobo under their Fujimi Fantasia Bunko imprint. As of October 2024, sixteen volumes and three short story collections have been published. Yen Press has acquired the license for the series in North America and published the first volume on September 24, 2019.
A manga adaptation of the series by Okama was serialized in Hakusensha's Young Animal magazine from May 11, 2018, to March 12, 2021. Seven tankōbon volumes were published from December 26, 2018, to April 28, 2021. Yen Press also licensed the manga for North American release, and the first volume was released on November 5, 2019.
An anime television series adaptation was announced at the "Fantasia Bunko Dai Kanshasai 2019" event on October 20, 2019. The series was animated by Silver Link and directed by Shin Ōnuma and Mirai Minato, with Kento Shimoyama handling series composition and Kaori Sato as character designer and chief animation director. Seima Iwahashi, Ryōta Tomura, and Ryūichirō Fujinaga of Elements Garden composed the series' music. The series aired from October 7 to December 23, 2020, on AT-X and other channels. Kaori Ishihara performed the opening theme "Against.", while Sora Amamiya performed the ending theme "Koori no Torikago" (氷の鳥籠, "Ice Bird Cage").

Funimation acquired the series and streamed it on its website in North America and Britain and Ireland, and on AnimeLab in Australia and New Zealand. On October 27, 2020, Funimation announced that the series would receive an English dub, which premiered the following day. Following Sony's acquisition of Crunchyroll, the series was moved to Crunchyroll.

A sequel had been green-lit on October 1, 2021, which was later revealed to be a second season. It is animated by Silver Link and Studio Palette, and directed by Yuki Inaba, with Studio Palette credited for series composition, Kaori Yoshihara designing the characters, and Elements Garden composing the music. It was initially scheduled for 2023, but was later delayed, and eventually premiered on July 10, 2024. The opening theme song is "Senaka Awase" (セナカアワセ, "Back to Back") performed by AliA, while the ending theme song is "Para Bellum", performed by Sizuk. Crunchyroll licensed the series. Plus Media Networks Asia licensed the series in Southeast Asia, broadcasting it on Aniplus Asia.

On August 6, 2024, it was announced that the fifth and future episodes of the second season would be delayed indefinitely, with the reasoning being "to maintain the quality" of the production. In its place, selected episodes from the first season occupied the remainder of its broadcast.

• Gods' Games We Play, another light novel series by the same author
• Why Does Nobody Remember Me in This World?, another light novel series by the same author