The Ugly Girl is Chaos Queen

The Ugly Girl is Chaos Queen is a fantasy comeback story about the eldest daughter of the Northern Realm's lord, mocked for years for her plain looks and modest talent. Aurora suddenly awakens a primal power of chaos within herself. Guided by a great master, she transforms her body and gains tremendous strength. She returns home to deal with old grudges just as dark forces threaten the realm. Complete in 51 episodes.