In a future devoid of warfare, the emergence of bio-robots called 'Fairies' marks a new era. Tatsuki, a high school student, and his sister-in-law, Akane, encounter five Fairies – stunning girls equipped with mechanical wings and massive guns. These Fairies implore Tatsuki to engage in the competitive spectacle 'Fairy Combat'. However, in his debut bout, he crosses paths with a formidable opponent dubbed 'Warrior Princess'...