Midori Hagino, a reserved 15-year-old from Japan's Kansai region, serves as one of the central figures in the X-Maiden. Her pronounced shyness contrasts with her role as a defender of humanity. She immerses herself in books, particularly literature on love and the occult. Alongside teammates Jun Akamaru, Aoi Tachibana, and Wanderlei Zillminnko, Midori operates from a concealed base, using specialized weapons to strategically counter the Firow, an extraterrestrial species that launched hostile actions against Earth in 20XX.