The operation to liberate Windbloom is in full effect! While the united Otome begin their assault, Sergay makes an attempt to free Nina from the burden of the Harmonium. When Duke Nagi discovers Sergay's treachery, Major Wong is critically injured and Nina is forced to maintain constant control of the Harmonium in order to keep him alive. As the force of the Harmonium draws upon the young Otome her health and sanity begin to deteriorate. Arika and Mashiro push forward into Fuka Castle for the final confrontation! Using the newly realized powers of the Blue Sky Sapphire, can Arika save her ailing friend or will she lose Nina forever?