Feature-length spin-off of the anime series following the adventures of a young girl with special abilities who is trained in the art of the sword. Saya Kisaragi (voice of Nana Mizuki) has finally developed an understanding of the cruel process of experimentation that gave her unique powers but also tore apart everything she loved. Armed with a burning sense of injustice, she sets out to gain revenge on those responsible for her ordeal and to get to the bottom of the experiments carried out by the secret organisation called Tower.