Lord El-Melloi II's Case Files: Rail Zeppelin Grace Note - A Grave Keeper, a Cat, and a Mage

Years after the Fourth Holy Grail War, Waver Velvet becomes the head of the Modern Magecraft Theories department at the Clock Tower, succeeding the title of Lord El-Melloi II. Waver and his apprentice Gray set out to find the truth behind a mysterious shadow that stalks them, while trouble brews among the mages of the Association.

(Source: MAL)