Kuro Mahou Ryou no San Akunin

By the Reiwa era, delinquents have been completely eliminated even from schools of magic... or so everyone thought. Even the "Black Magic Dormitory", formerly a wild and out of control place where the dark magic ne'er-do-wells gathered, is now on the verge of being demolished due to no new students having been placed into it for ages. The dorm's poor environment, residents receiving scorn and distain from teachers, and resulting low prospects of employment after graduation made the dorm's popularity sharply drop starting with Gen Z... until this year, when three female students are placed into it! So each of them makes an oath to themselves that they'll escape from the dorm, no matter what happens to the other two! However, those girls do not yet know the dreadful prophecy, which will affect the entire magical world, that is descending upon them.