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.
This game is about the ingenious and subtle ways women extract their revenges. Tokiko enters the establishment and gathers information about her enemies until she considers that she has prove enough in her hands to appeal to people of higher authorities (the Shogun's wife for example) to eliminate her targets. And the longer she stays there, the higher her position in the harem becomes and the deeper she is involved in the political intrigues in which she only plays a small part...
