Treasure Buried is Treasure Wasted
After participating in a swordfighting tournament, Ryuuki discovers his exiled brother Seien is closer at hand than he previously believed.
Aired 29/04/2006EP 4 - Treasure Buried is Treasure Wasted

The Story of Saiunkoku
Saiunkoku is a world of eight provinces or houses, each named after a different colour. The new Emperor, Shi Ryuuki, has gained a reputation for being uninterested in courtly matters and for flaunting his love for men. Shuurei, although born of the important Kou family, has difficulty making ends meet. She easily accepts an invitation to be the Emperor's concubine in order to turn him into a good ruler. The mysterious Seiran, a young man who was adopted by her father, goes with her as Ryuuki's bodyguard. Entering the imperial palace revives Shuurei's dream of being a court official, and, together with the many companions she meets along the way, continues moving bravely forward while trying to fend off the Emperor's advances.
(Source: Anime News Network)