Maintaining her routine in the White World, Airi led an ordinary and peaceful life. Meanwhile, in the Black World, Luna held the throne as queen. However, their fates were about to intertwine as a sudden coup d'etat flipped their worlds upside down. Airi found herself exiled to the Black World, while Luna was forced to adapt to life in the White World. As chaos erupted, questions arose about the secrets hidden within these worlds and the possible connection between Airi and Luna.