Zero no Tsukaima Chevalier

A war is ongoing between Tristain and Albion, and Louise, a mage considered a failure, has been assigned a classified mission. Before engaging in the conflict, she must first confront resistance from her own family. She must persuade her indifferent older sister that she is no longer a Zero. Saito and Siesta accompany her, and their time at Louise's family's luxurious palace causes them to reconsider their feelings for her. As social standing creates distance between Louise and Saito, their emotions grow more complicated, leading to a tense romantic situation.