Sidonia no Kishi Zenjitsudan: Dai-4-ji Gauna Boueisen
シドニアの騎士 前日譚 第四次奇居子防衛戦
A prequel story included with the initial release of the first Blu-ray volume of the *Sidonia no Kishi* anime. This one-shot was also later compiled into the final seventh volume of the Shinsōban edition.
