Saintess Maria died 300 years ago because of her magic, and Avelron, her faithful knight, was unable to save her. Yeriel Hyem is a lively and cheerful girl who has no idea that she is actually Saintess Maria. Yeriel leads a tranquil life with her beloved parents and younger sibling, until she meets Levnaor, a fascinating and enigmatic man who adds even more light to her life. However, unexpected and mysterious events arise as a result. Yeriel may have to confront her tragic past in order to safeguard her bright future, but will she be able to handle it?