One year after the events of Mai-Otome, an asteroid on collision course with Windbloom kingdom is destroyed — barely — by an international task force of Meister Otome. Subsequently a new and more powerful kind of Slave appears, along with a sinister black-robed entity — or entities — able to easily overpower the most powerful of Meisters. Not only that, but Arika and Mashiro's troubled relationship is hindering the use of the Blue Sky Sapphire — possibly the only weapon powerful enough to defeat the new adversary.

Source: ANN

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Prequel: Mai-Otome