Ep. 17: Hostile forces invade Windbloom, shutting down Otome technology and forcing Arika to fight Erstin.
Aired on February 2, 2006

As hostile forces invade the capital of Windbloom, all Otomes are summoned into battle. An enemy plan causes the source of the Otome technology to shut down. Arika learns that Erstin is an agent of Schwartz, who intends to capture Princess Mashiro, and they are forced to fight against each other. Sergay, trying to protect Arika, reveals himself as her benefactor, and admits that she may be the true princess, causing Nagi to realize that Sergay has withheld information. Nina, greatly upset by Sergay seemingly favored Arika, attacks Arika, but Erstin blocks the attack with her Slave and dies telling her friends she most wanted to be with them. Arika and Nina clash, creating a large explosion.
Episodes
- Ep. 13 · Arika faces love and duty while Akane chooses elopement over duty
- Ep. 14 · Arika's friends worry about her strange behavior while Shizuru investigates the conflict between Romulus and Remus.
- Ep. 15 · Sergay Saves Arika While Considering Her Royal Identity
- Ep. 16 · Arika, Nina, and Erstin vow to become Meister Otomes while a coup unfolds.
- Ep. 17 · Hostile forces invade Windbloom, shutting down Otome technology and forcing Arika to fight Erstin.
- Ep. 18 · Mashiro joins refugees after Windbloom raid while Nina serves Nagi and Aoi protects her
- Ep. 19 · Mashiro reunites with Arika in Aswad while Natsuki and Nao seek aid from the Republic of Aries
- Ep. 20 · Nina grows closer to Sergay while Natsuki seeks help from Cardair
- Ep. 21 · The White Princess Awakens and Political Maneuvers