Nanatsu no Maken ga Shihai Suru: Side of Fire - Rengoku no Ki

A struggling mage named Alvin Godfrey enrolls at Kimberly Magic Academy lacking the ability to perform any spells, leading to ridicule from others. Despite these challenges, he confronts the dangers present at the academy, builds friendships, and eventually rises to become student body president. This story, occurring five years before the events of Reign of the Seven Spellblades, details how Godfrey acquired the nickname Purgatory.