Reign of the Seven Spellblades, Vol. 7 (light novel‪)‬

There’s no “I” in “Team”
The Kimberly Magic Academy combat league approaches, and the school’s future may be riding on it! Now third-years, Oliver and his friends jump at the opportunity to showcase their growth, splitting into three-person teams and entering the event. However, the competition’s extravagant rewards are merely a ploy by the headmistress to ascertain who murdered Instructors Grenville and Forghieri; what’s more, the results of the combat league will influence the outcome of the looming school election. Yuri, meanwhile, is pursuing the culprit behind the Case of the Stolen Bones: seventh-year Cyrus Rivermoore. Just what is that warlock planning…?