The Melody of Oblivion - Monotone (Vol. 2) - Region 0

Is the saving of innocent lives a worthy cause when everyone else condemns you for the act? This burden weighs on Bocca's heart as he continues his fight against Midnight Hiyoko. But who is the real enemy? Later Bocca and Sayoko arrive at a town filled with mechanical mice and meet a girl who could be a warrior of Melos if it weren't her hatred of warriors.