Fate wants nothing more than to save Roxy from certain death in Galia, a death to which her fellow holy knights condemned her. As he follows Roxy's trail, he encounters a Galian girl he once met: Myne, who wields a black axe that eerily resembles Fate's own black sword.  Myne agrees to help Fate fight the monsters between him and Galia—but once they get there, he must repay her favor in kind.