Isekai de Migawarihime Ninari Haou ni Ubawaremashita

In the midst of chaos, Serina, an ordinary woman, finds herself suddenly transported into the midst of the Kingdom of Sipitria, where she bears an uncanny resemblance to Ceres Diana, the infamous and ruthless princess. The kingdom is under attack by the neighboring Heilbronn Empire, and Serina's confusion is short-lived as she is coerced into taking the place of the princess. As the "princess," she is taken captive by Gilbert, the arrogant and intimidating prince of the Heilbronn Empire. With her fate now in his hands, Serina must navigate the complexities of her new situation, where the question remains: will she become the prince's plaything, or will she find a way to forge her own path?