Wizrain Oukoku Monogatari: Shiitagerareta Shoujo wa Zense, Kuni wo Mamotta Ryuu Deshita

Elna, the adopted daughter of a baron, lives in the Wizrain Kingdom and endures constant abuse from her elder stepsister. But one fateful day, it all comes rushing back to her. In a past life, she was the famed dragon Elnarfia who protected the nation and longed to be human! Soon, a kingdom-wide search for the girl who is Elnarfia’s reincarnation brings Elna face-to-face with a dear friend from her previous life: the legendary hero, now reborn as the king of Wizrain. But can the two of them rekindle their old bonds, or will they have to start from square one in this new life…? (Source: Yen Press)