"I'm a Maid, but I've Pulled Out the Holy Sword?!" centers on Leticia, a humble maid working in a noble household. Her life takes an unexpected turn when she discovers the legendary Holy Sword, a weapon said to be wielded only by the chosen hero destined to save the world. Despite her ordinary status, Leticia effortlessly pulls the sword from its resting place, an act that shocks everyone, including herself. This event thrusts her into a role she never anticipated, as she is now recognized as the world's savior.

The narrative explores Leticia's journey as she navigates her newfound responsibilities while grappling with her identity as a maid. Her lack of combat experience and self-doubt contrast sharply with the expectations placed upon her as the Holy Sword's wielder. Along the way, she encounters allies who support her, including knights, mages, and other adventurers, each with their own motivations and backstories. The story balances moments of humor and lightheartedness with the challenges of her heroic duties, creating a blend of fantasy, adventure, and slice-of-life elements.

As Leticia grows into her role, she faces various threats, including monsters, dark forces, and political intrigue. The Holy Sword itself becomes a focal point, with its powers and origins gradually revealed. The series delves into themes of self-discovery, courage, and the idea that heroism is not defined by one's background but by their actions. Leticia's journey is marked by her determination to protect those she cares about while staying true to her roots as a maid, offering a unique twist on the traditional hero's tale.