"Strike Witches" is set in an alternate version of Earth during the 1940s, where humanity faces an alien threat known as the Neuroi. These mysterious beings, resembling mechanical creatures, have invaded and occupied large portions of the world, causing widespread destruction. To combat this threat, humanity develops advanced technology that combines magic and machinery, enabling individuals known as Witches to fight the Neuroi. Witches are young girls with innate magical abilities, enhanced by Striker Units—mechanical devices worn on their legs that allow them to fly and wield powerful weapons.

The story centers on Yoshika Miyafuji, a kind-hearted and skilled healer from Fuso (an alternate version of Japan), who is recruited into the 501st Joint Fighter Wing, an elite unit of Witches tasked with defending humanity. The 501st, also known as the Strike Witches, is composed of girls from various nations, each representing their homeland and bringing unique abilities to the team. Key members include Mio Sakamoto, the disciplined and experienced leader; Lynette Bishop, a skilled sharpshooter from Britannia; and Perrine H. Clostermann, a proud and talented Witch from Gallia.

As the series progresses, the Strike Witches engage in numerous battles against the Neuroi, uncovering more about their origins and capabilities. The narrative explores the personal struggles and camaraderie of the team, highlighting their growth as individuals and as a unit. Yoshika’s journey is particularly central, as her determination to protect others and her unwavering optimism inspire her teammates. The series balances action-packed aerial combat with moments of character development, delving into themes of friendship, sacrifice, and resilience.

The overarching plot involves the Witches’ efforts to push back the Neuroi invasion while uncovering the truth behind their existence. Key story arcs include the defense of key territories, the discovery of advanced Neuroi technology, and the emotional toll of war on the young protagonists. The series also incorporates historical and cultural references, blending real-world elements with its fantastical setting. Through its mix of high-stakes battles and heartfelt character interactions, "Strike Witches" presents a compelling narrative that appeals to fans of both action and character-driven storytelling.