With hostile forces invading the capital of Windbloom, all Otomes are summoned into battle. But 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.