Iki Okure Seijo no Shiawase - Konyaku Hakisareta to Omottara Mazoku no Ouji-sama ni Dekiaisaretemasu!

Huh? Youre already 27 years old. The Saint Marialights engagement with the crown prince was called off because of her age! Due to various circumstances, the level-headed Marialight acknowledges and returns to her hometown. She encounters a child raised in secret? What's more, after growing up in a short amount of time, he falls for Marialight, and wants to take her back to his own country! A romantic fantasy story about a level-headed saint who gets dumped for being in her late twenties and ends up living with the demon prince instead! The adored fantasys long awaited serialization!