Akashic Records of Bastard Magic Instructor v01-v04 (2017-2018)

English translation of the Japanese manga Roku de Nashi Majutsu Koushi to Kinki Kyouten (ロクでなし魔術講師と禁忌教典).
Sisti is a magic-user in training who attends a prestigious magical academy where she hopes to be trained by the best of the best. However, when her instructor suddenly retires, his replacement is anything but what Sisti had hoped for - idle, incompetent, and always late! Can Sisti still learn magic and unravel the secrets of the mysterious Sky Castle with such a terrible teacher as her guide?