

In the world of Daikuuriku, everyone is born female, and chooses which sex they wish to become at age 17. In this world, the peaceful theocracy of Simulacrum is guarded by magical flying machines called "Simoun," which can only be piloted by young girls who haven't chosen a sex yet. When the industrialized nation of Argentum decides that it needs to invade Simulacrum to acquire the secret of the Simoun, war breaks out, drawing the Simoun Sibyllae into a lopsided battle.

Tragedy strikes Chor Tempest in its first battle against the air fleet of the Argentum Archipelago, and two mysterious new Sibyllae join the chor.
Aired: 4/4/2006
Elly must choose whether to become male or female when she visits the Spring to choose her sex, and Aer tries to convince Neviril not to follow Elly into the Spring.
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