Arabesque Koukyuu no Wakoku-hime

Lyra, a consort later spoken of in legend, was originally a princess of the Wa Kingdom. Captured through a conspiracy, she was forced into the harem of the Daryl Empire. However, in this harem, there was a path to release if she refrained from bearing children for several years! She found hope and resolved to avoid getting close to the Sultan, aiming for her term of service to end.

But she was immediately tested by the Empress and provoked by arrogant consort candidates. Lyra overcame numerous predicaments, demonstrating the intelligence and innate cheerfulness cultivated by her parents. Gradually, she became beloved by those around her, even showing glimpses of her potential as a wise ruler… But as a result—why did she end up rising to the top and being treated as a favorite concubine?!

(Source: Kadokawa, translated)