Akashic Records of Bastard Magic Instructor manga volume 15 features story by Hitsuji Tarou and art by Tsunemi Aosa.

Glenn, his students, and the entire town of Fejite are trapped underneath the Flaming Ark, a flying battleship with the power to burn whole cities to ash. With a seemingly invincible demon at the ship’s helm, the odds are stacked against the city’s defenders. It’ll take everything they’ve got to stand a chance, and so Glenn makes the tough choice to use a power he’d abandoned long ago, even if it means coming face-to-face with all the trauma of his past.