Simoun - Vol. 5: Song of Prayer

All the residents of Daikuuriku are born female, but can choose their gender at the age of 17. Young girls called Sibyllae fly the Simoun, magic aircraft that can maintain peace or enact destruction. Volume five of this series depicts the instability after a war between Simulacrum and the invading country of Argentum, fought by the Simoun. Now that the war is over, the Sibyllae must pick their permanent genders. What paths will they take?