The Starlight Dragon - Realm of Camellia Series, #4

After a year of hard training, Kira's time at Gekko-ji is coming to an end. Her ceremony is cut short when the army arrives with a powerful weapon and new laws restricting magic. Now everyone in the Realm of Camellia is in danger. When strange magic starts appearing across the realm, Kira must decide whether or not to continue playing the political game. Or become a rebel. As more anomalies appear, Kira and her friends set out to undo the evil wrought by the same man responsible for separating Kira's family.
In order to defeat him, Kira must delve into a centuries-old mystery and seek out allies both old and new. Can she unravel the secrets of the past and save the realm from total darkness?