Bright Sun of Agni

Princess Azula, the ambitious and ruthless younger sister of Fire Lord Zuko, hears from a mysterious peasant woman that she will one day be Fire Lord. When her brother dies a sudden and untimely death, Azula sees an opportunity to take the throne from his rightful heir, her niece, Crown Princess Izumi.

Left widowed and vulnerable after the death of her beloved husband, Fire Lady Katara, looks to protect their children from an aunt who wants to get rid of them. When her two sons are captured and imprisoned, she sends her daughter, Princess Izumi, the rightful heir to the throne, into hiding.

Fleeing into the Earth Kingdom under the protection of seven fearsome, female warriors, Princess Izumi settles in an abandoned shrine and trains for the day she can retake the throne from her usurping aunt. That is, if she can survive Azula's assassination attempts.