Girly Air Force (ガーリー・エアフォース, Gārī Ea Fōsu) is a Japanese light novel series written by Kōji Natsumi and illustrated by Asagi Tōsaka.

Earth has come under attack by the Xi (ザイ, Zai), a mysterious "armed group" using highly advanced weapon systems far superior to any existing human-developed military technology.

A young Chinese-Japanese teenager named Kei Narutani and his Chinese friend Minghua, both living in Shanghai, are forced to evacuate to Japan when the city is attacked by the Xi.

In order to combat the Xi, their technology—HiMAT (Highly Maneuverable Aircraft Technology) and EPCM (Electronic Perceptory Counter-Measures)—was reverse-engineered and applied to existing fighter models, codenamed "Daughters"; in order to function properly, the Daughters require autonomous interface units called "Anima", cyborg girls who are grown around salvaged Xi parts.

When her supervising developer notices that effect, he invites Kei into the Anima project and act as Gripen's partner in order to boost her flight performance and prevent her from being scrapped.