Mai-Otome 0: S.ifr

Sifr lives in a world built upon the remnants of a once-great scientific civilization, until forces seeking a secret within her blood make her their target. Bruce and his attendant Lena Sayers save her from an attempted abduction, bringing her under the protection of a woman with extraordinary power.

Her pursuers refuse to relent, and the conflict escalates as Sifr's connection to ancient weapons comes to light. Lena faces mounting restrictions and dangers to defend her, while Sifr struggles to understand why her life has become the key to destructive power she never chose to possess.