Watashi no Tsukutta Sennen Oukoku Tensai Madoushi no Jiyuu Kimamana Tensei Musou-tan

A powerful magician named Leticia defeats an evil dragon and saves the world before dying and creating a thousand-year barrier. She expresses a desire to live an ordinary life in her next existence. Two hundred years later, she is reborn as a thin girl who is captured and mistreated by beastmen. After remembering her past life, she is angry with God for giving her a harsh and far from ordinary new life. When she encounters God again, she is informed that another evil dragon is about to emerge. The story follows Leticia's journey in her second life, as she moves through the world while concealing her extraordinary abilities.