The Familiar of Zero: Knight of the Twin Moons

 (ゼロの使い魔: 双月の騎士, Zero no Tsukaima: Futatsuki no Kishi) is the second season of The Familiar of Zero anime directed by Yū Kō which ran from 9 July 2007 to 24 September 2007. It was succeeded by The Familiar of Zero: Rondo of Princesses.

Plot
Louise de la Vallière's and Saito Hiraga's adventures continue as master and familiar spirit. More characters are met such as Agnès de Milan, Captain of the Tristain Musketeers; Julio Chesaré, a Romalian priest but an expert swordsman; Sheffield, the Governor of Albion and the season's main antagonist; the return of the revived Prince of Albion; and Tifania Westwood, a half-elf. Louise's older sisters are also introduced: Éléonore de la Vallière, Louise's eldest and strict sister; and Cattleya de la Fontaine, Louise's older and kind sister.