The Familiar of Zero: Knight of the Twin Moons

Louise is a magician at the Tristein Academy, dubbed with the nickname "Zero Louise" due to her inability to effectively use her magic properly, resulting in zero successes. An upcoming test at her academy requires her to summon a familiar, a servant and partner to support her as a magician. Despite desiring a familiar that would be superior to her constantly mocking classmates, Louise ends up summoning Hiraga Saito, your average Japanese boy. Even with Louise and Saito both unwilling to accept each other, they have no choice. Louise cannot attempt another summoning and Saito cannot return to Japan, and so their life together begins. Based on the novel by Noboru Yamaguchi.

The fourth and final season of The Familiar of Zero. Saito and Louise feel their bond deepening as the days go on, and they feel it might be time to take the next step in their relationship... But before that, the Queen has a mission for them. She sends them to the pope, who has both Louise and Tiffania become holy maidens. And with all the interruptions around, by both friends and foes, Louise and Saito's love will be tested to the limit.

Following Saito's heroic actions in the War with Albion in season two, Saito & Louise return to Tristain, only to have the runes which bind Saito & Louise disappear. Saito & Louise struggle with a relationship no longer defined as Master & Familiar, as they search for an Elf who has the power to restore the dead to life, and may hold the key to understanding Saito's loss of the Gandalfr's power.

DVD beach episode of Zero no Tsukaima: Princesses no Rondo. Also known as episode #6.5.