Kasen Koushu Yawa: Sono Reijin, Koukyuu no Yami wo Kiru

Legend has it that the founding emperor of the kingdom of Kisho was a wise sage. One day, Xiang Minghua, the proprietress of a bar, is visited by Li Boqing, a young candidate for Prime Minister.

In fact, Minghua's true identity is the Princess Huaxian, who is rumored to be the illegitimate daughter of the previous emperor. He has come to offer Minghua a deal to help save the country, which is on the verge of destruction, and help the young emperor, Ziqi. Minghua, who cares more about Ziqi than the kingdom, decides to accept Minghua's offer, but with another goal in mind....

(Source: Akitashoten, translated)