From Wingtip Cafe: During the Heian era, a noble chief councillor of state had two children who wished they were of the opposite gender. Lady Kira is a strong, willful girl, while Lord Kira is a weak, beautiful boy. Because of their characters, their father raised Lady Kira as a boy and Lord Kira as a girl. The manga is based on a novel from the late Heian era called “Torikaebaya Monogatari”.