Episode 1: Due to father's death, Xian was called back to castle. Being the chairman of the greatest conglomerate in Japan, father has made Xian as his heir. Just for some reason he became to dislike his own father, and left for starting his owe career. 
Episode 2: One day, Chin-Mei was assassinated suddenly. Xian thought this could be the challenge against his. 
Episode 3: Zheng-Li found the demand of his can not obtain so easily. And after Zuo-dai and Zheng-Li's horrible death, the survivor finally found the secret of the castle. 
(Source: AniDB)

Tsubaki-iro no Prigione