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Juusan Sai no Tanjoubi, Kougou ni Narimashita.

Finished

十三歳の誕生日、皇后になりました。

On her thirteenth birthday, Rian is sent to the harem of the emperor of Sekisou Kingdom. However, the person receiving her is Akatsuki, who has usurped the throne through legitimate means to become the new emperor. Rian is made empress because she is deemed suitable, but despite sharing a bed, Akatsuki treats her like a child, using her only as a hot water bottle to warm his bed.

To help Rian sleep, Akatsuki challenges her with a problem to solve every night. As they spend time together, their relationship slowly evolves, and Rian begins to navigate the complexities of court life and her own feelings.

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