Izushiro 
The Greatest Magicmaster’s Retirement Plan: Volume 15 [EPUB ebook] 

Alus’s chance meeting with Fanon only lasts for a brief moment before Dante and his gang of escaped prisoners take advantage of the number one Magicmaster’s absence and attack the Magic Institute in search of a secret key! Faced with imminent danger, former Single Sisty Nexophia puts her pride on the line and takes on the band of criminals. Meanwhile, Tesfia, Alice, and Felinella get into their own fights!