Osanazuma wa Otona na Heika ni Torotoro ni Amayakasare Makuri: Ore no Hanayome ga Muku Sugite Kawai Sugite Shinbou Tamaran!

Leafa, the princess of Lutnak, arrives as a hostage and potential queen to Leorg, the king of Dirant, the suzerain state that rules the continent. Due to some misunderstanding, Leafa arrives at the tender age of seven, and Leorg, impressed by her innocent demeanor, opens up to her and promises her that they will marry when they grow up. Three years later, Leafa, now 10 years old and enjoying her time with Leorg, meets Peegy, a fairy in the shape of a piglet, on a snowy day. While pursuing Peegy, who claims to live in fairyland, she hears a mysterious voice coming from within a well...!?

Don't treat me like a child!! The newlywed romantic comedy fantasy story of a princess who has grown up with magical powers and her first love, His Majesty the King, begins!

(Source: Pomme Comics, translated)