On her thirteenth birthday, Rian is sent to join the harem of the emperor of Sekisou Kingdom.
However, the person receiving her is Akatsuki, who had usurped the throne through "legitimate means" to become the new emperor!
Rian is made empress, as she is deemed "suitable," but even though they share a bed, Akatsuki treats her like a child, like a hot water bottle to warm his bed.
To help Rian sleep, Akatsuki challenges her with a problem to solve every night!?
 
(Source: Kadokawa, translated)

On her thirteenth birthday, Rian came to Lychee Castle to ask the emperor of the Red Kanade Kingdom to admit her to the imperial court. She had studied hard to become the emperor's favorite consort, but when she finally made it to the audience hall, she was met by Xiao Tsuki, who had just usurped the throne and taken over as the new emperor. What's more, he announces something very surprising: he's going to welcome Rian as the Empress instead of a consort!? 
This is the beginning of a love story between Rian, who has become the usurper's empress, and the emperor, Xiao Yue, who has taken Rian to be his wife. 
 
(Source: Akita Shoten, translated)

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