Arabesque Koukyuu no Wakoku-hime

Lyra, a consort whose name will be passed down to future generations as a legend, was originally a princess of the Kingdom of Wa. She was captured in a conspiracy and forced into the harem of the Daril Empire. However, in this harem, she had a path to freedom if she remained childless for several years! This gave her hope, and she resolved not to approach the Sultan, but to wait until her term of indenture expired. However, she was soon tested by the Empress and provoked by a haughty consort candidate. Lyra overcame numerous adversities by displaying the intelligence and natural cheerfulness forged by her parents. She gradually became beloved by those around her, and even showed glimpses of her potential as a wise ruler... But as a result, why has she risen to the top and been treated as a favorite concubine?

(Source: Kadokawa, translated)