This OVA episode was written by the author, Kagami Takaya himself. The episode consists of three short stories, two of which were created based on ideas tweeted in by fans, and one of which is a crossover with another of Kagami's work, The Legend of the Legendary Heroes.

Note: Unaired 13th episode bundled with the limited edition of volume 9 of the original novel.

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Other: Densetsu no Yuusha no Densetsu
Prequel: Itsuka Tenma no Kuro Usagi