Granbelm

Granbelm takes place in a world where magic was once abundant but its use in war led to chaos. This led seven powerful mages to give up their lives to seal magic with the Magiaconatus. Now, nearly a thousand years later, the Magiaconatus hosts the Granbelm tournament, where participants compete for the title of Princeps, the true mage. High school student Mangetsu Kohinata is unexpectedly transported to an illusionary world where she encounters six mages participating in Granbelm.