Manga adaptation of late Heian novel Torikaebaya Monogatari (&#12392;&#12426;&#12363;&#12408;&#12400;&#12420;&#29289;&#35486;), literally "If only I could exchange them!". It is the tale of two siblings whose mannerisms are those of the opposite sex, and their relationships in the Emperor's court. 
source: wikipedia

In Heian era, a noble chief councillor of states had 2 children who wished they were opposite gender. Lady Kira is strong, willful girl, while Lord Kira is 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 late Heian era called “Torikaebaya Monogatari”.

A series of short stories and longer works compiled in 20 volumes. 
1. Sakura no Mori no Sakura no Yami (桜の森の桜の闇) [Volume 1] 
2. Torikaebaya Ibun (とりかえばや異聞) [Volume 1-2] 
3. Aozukin (青頭巾) [volume 2] 
4. Fuuin Gaka (封印雅歌) [Volume 2] 
5. Bernstein (ベルンシュタイン) [Volume 3] 
6. Kira no Rondo (煌のロンド) [Volume 3] 
7. Suimen no Tsuki no Ouji (水面の月の皇子) [Volume 4] 
8. Yomibito Shirazu (読み人知らず) [Volume 4] 
9. Fuurenki (風恋記) [Volume 4-8] 
10. Nue (鵺) [Volume 9-12] 
11. Yume Urabune (夢占舟) [Volume 9] 
12. Kage ni Aisareta Otoko (影に愛された男) [Volume 13] 
13. Hiru no Tsuki Yoru no Kodama (昼の月 夜の谺) [Volume 13] 
14. Yuki Kurenai no Miko (雪紅皇子) [Volume 14] 
15. Suikin Kutsu (水琴窟) [Volume 15] 
16. Ageuta (上ゲ哥) [Volume 15] 
17. Kimi wo Matsu Kyuujuuku Yoru (君を待つ九十九夜) [Volume 15] 
18. Fuchi Tonarinu (渕となりぬ) [Volume 16-20] 
19. Gekkou Shiro (月光城) [Volume 20] 
20. Genshou Yuugi Light Version (幻想遊戯 Light Version) [Volume 20]

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