Following the aftermath of Zero no Tsukaima: Princesses no Rondo, Saito Hiraga and Louise Françoise Le Blanc de La Vallière embark on a mission to confront King Joseph in the Holy City of Romalia, aided by two individuals wielding the enigmatic power of the 'void.' Amidst escalating conflicts, a long-dormant malevolence stirs in the shadows, testing the strength of their bond. As they navigate through daunting trials, will their relationship evolve into something deeper, or will the hardships they endure drive them apart? Zero no Tsukaima F chronicles the ultimate trials faced by Louise and Saito as they stand united against formidable foes.