Belle Poupée no Supadari Konyaku: "Konomi ja Nai" to Iwareta Ningyou Hime, Gaman wo Yametara Ouji ga Deredere ni Natta. Jitsu ni Ui!

The Duchess Laetitia is nicknamed “Belle Poupée,” the beautiful doll. Despite her fragile appearance, she is actually a dashing heroine who charms both men and women alike! With a magical artifact, she can transform herself into the powerful warrior known as the “Imperious Ice Dragon,” but her true identity is known only to a few people. She is engaged to Gilbert, “The Cursed Prince,” who is rumored to have a wicked personality. Gilbert has always treated her coldly since they first met, but when she got to know his loneliness and clumsy kindness, Letitia's heart is touched… "I will make you happy, Master." The turbulent newlywed life between the strongest heroine and her love-struck husband begins now! (Source: Square Enix Novels, translated)