Flower's Secret Within Shogun's Harem

Flower's Secret Within Shogun's Harem is an adventure Otome romance game that takes place in the Tokugawa Bakfu era. After Shimabara Rebellion, Tokugawa Iemitsu has been cursed. To solve his curse, you, his sister, who inherits the blood of a mermaid, need to marry the one who inherits the blood of a dragon, and the potential candidate is one of the officials that work for your brother.