Dentsu and Production I.G. are teaming to produce GUARDIAN OF THE SACRED SPIRIT, an animated TV series based on Nahoko Uehashi's bestselling young-adult novel series, reports VARIETY. Kenji Kamiyama will direct, while Gato Asao handle character design. The tale follows Barusa, a female sword fighter who must defend the New Yogo Empire's young prince from alien killers. The book series has won several prizes and has sold more than 400,000 copies in Japan alone.