Akashic Records of Bastard Magic Instructor light novel vol.2

The school is under attack and Rumia has been captured! To make matters worse, Glenn suspects that the culprits are part of an organization of merciless mages. There’s only one way they could have breached the school’s defences: with the help of a traitor. Sistine and Glenn will have to learn to cast their magic together if they want to stand any chance of saving Rumia and the school.