Magia the Ninth Vol. 2 (manga)

Sumura Takeru, now known as Brahms, is on track to become a full-fledged "magia," a wizard who battles demons with musical powers. But Beethoven discovers some shocking details about Brahms' past and throws him out, leaving Brahms to wander the city streets alone. Confused and hurt, Brahms falls prey to the power of Mozart, who awakens a terrible force within him. Will Beethoven be able to reclaim Brahms' soul before his destructive power lays waste to the entire city?