Oookuki sets stage in the Edo period where the warring times has passed and the Tokugawa Bakufu has unified Japan. Although the land has regained peace, to ensure the nation's stability, the Shogun seeks to reclaim power from the daiyos. This strategy adventure game tells the story of Tokiko, a daughter of a lesser daimyo who was falsely accused and latter forced to commit Seppuku. The young Tokiko narrowly escaped death and was brought up by one of her father's retainers as his own. But to avenge her biological father, Tokiko gave up her stable life and enters the political whirlpool that is the Shogun's harem (Oooku) as a servant girl and seeks to eliminate her enemies one by one through clever ploys.

Taken from PSXDataCenter.