After one year since the coup against Nagi, a powerful new enemy threatens to disturb the peace of the world. While Meister Arika is ready to protect the people, an argument between her and Queen Mashiro could prove to be her undoing.

Arika takes a trip to Aries to search for Mashiro. However, she becomes involved in a bus hijacking. To make matters worse, a mysterious Slave appears along with the shadowy entity that attacked Garderobe.

Nao and Nina are investigating some hidden ruins that may hold the key to ending the current crisis. There they discover a book of importance. However the shadow entity is intent on stopping them at all costs and preventing the book from leaving the place.

Leaving her past behind, Nina regains the powers of an Otome to help Arika in the final face off against the mysterious entity. The other Otomes aid by trying to stop Childs that have spawned across the world.