Ten years after the Fourth Holy Grail War, magic instructor Waver Velvet, now titled Lord El-Melloi II, investigates strange cases across the Clock Tower's world of mages, aided by his hooded apprentice Gray. When a deceased noble's will puts Adra Castle up for inheritance, the pair travel there to press El-Melloi II's claim, only to find rival magi, including Luviagelita Edelfelt, competing in a deadly game of wits for the same prize. This manga adapts the original light novel.