Akashic Records of Bastard Magic Instructor Vol. 12 (manga)

A KILLING CONCERTO

Just when Glenn and the Special Missions Annex think they've averted catastrophe, the Right Hand of Evil makes his final play. Using the power of his unnatural music, Zayd is ready to bring death and ruin upon Rumia Tingel and everyone at the school's dance contest. It's a race against time as Glenn and Sistine try to save the princess from bloody catastrophe!