[Light novel] I became an empress on my thirteenth birthday. (9 books in total)

Publisher: KADOKAWA/Enterbrain
Author: Rinne Ishida, IZUMI
Size: 105mm x 148mm
Number of books: 9
Language: Japanese
Category: Light novel, manga
Latest publication date: 2024-01-13

Synopsis:
Love story (Cinderella story) starting after becoming a couple!

On his thirteenth birthday, Ryo asked the emperor of the red play to enter the shrine.
However, during the audience, it was Akatsuki, who became a new emperor of the Emperor by using the regular means!
Ryo is said to be "just right", but even if he starts to sleep together, he is treated as a child instead of a hottie.
Nevertheless, Akatsuki gave me a problem every night so that Riku could sleep!?
A love story that deepens the bond between the couple every night!