Mirror Sword and Shadow Prince

Mirror Sword and Shadow Prince is the sequel to Dragon Sword and Wind Child and the second book of the "Jade Trilogy," written by fantasy writer Noriko Ogiwara. The novel was originally published in Japanese as Hakuchou Iden (白鳥異伝 Swan's Strange Legend).

Viz Media LLC, a publisher of English-translated manga, published the novel in English in May 2011. The third book in the trilogy, Usubeni Tennyo (薄紅天女 Pink Nymph), has not been translated into English.

Plot summary
Set generations after the events of Dragon Sword and Wind Child, the descendants of Saya and Chihaya now rule Toyoashigahara as the Imperial family, ruled by the emperor of Toyoashigahara. Due to their descent from both the Water Maiden and divine heritage and fears that their inherent power will cause destruction, the members of the Tachibana family (the descendants of the people of Darkness) have served as their guardians to quell their destructive nature. Over generations, the Tachibana have scattered throughout Toyoashigahara into five clans, each holding a magatama of a different colour with the ability to quell the emperor's heart.

Toko, the daughter of a Tachibana chieftain, is raised alongside Oguna, a foundling boy adopted by her parents. Inseparable in childhood, the bolder Toko sees it as her duty to defend the quieter and more submissive Oguna. When Toko's cousin, the Lady Akaru, is prophesized to become the new bride to the Emperor and bearer of the clan's magatama, Toko and Oguna's lives are abruptly changed.