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https://www.cmoa.jp/title/291867/
17-year-old Kaito has someone she can never forget—her first love, Haruka. Haruka passed away when they were children, and ever since then, Kaito has lived her life without falling in love again. One day, she hears someone calling her name. Drawn by the mysterious voice, she finds herself entering a bookstore. The moment she picks up a certain “book,” Kaito is suddenly transported to another world. And waiting for her there is... a little demon lord who looks exactly like Haruka!? https://www.cmoa.jp/title/306608/
https://mechacomic.jp/books/209206
70Wait for me, Louisa. Her lover, Graham, who was chosen to be a hero said so and went to defeat the Demon Lord. But I don't feel like waiting. To tell the truth, I was betrayed by the hero of the lover three times in the past life in Louisa. So the fourth time the world does not wait for the brave anymore, I will be absolutely happy for myself-! Source: MU
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)