The neglected orphan Iris is saved from loneliness when a kind boy named Rieffe befriends her, telling her to value herself.

Having inherited a piece of the February Magician's powers, Iris grows up learning how to deal with adversity well. That is, until the fateful day when her destiny becomes entangled with the Magicians.

Iris is forced to choose between morally ambiguous situations and faces the threat of Augustia, the most powerful Magician. Forming bonds with other Magicians to face against the Empress Augustia, Iris will become one of the most important gears in MO's overarching story.

[From official website]