Stella was never shown love by her family, nor was she blessed with any special talents from God. When her beautiful sister loses the heart of her fiancé and escapes to a monastery in disgrace, Stella is quietly cast aside. But in this new chapter of her life, she discovers unexpected joy… in cleaning. Assigned to work as a maid for Prince Cecil a mysterious royal who lives sealed away in a room filled with toxic gas Stella begins to find purpose in the simple act of purification. Before long, she awakens a hidden ability: the rare skill of Purification. When her newfound power combines with Prince Cecil’s destructive magic, the two are able to transform monstrous magical beasts into gentle, holy creatures. As Stella's strange abilities grow stronger, so too do the mysteries surrounding her past. Could this unremarkable maid possess a saintly power... and a secret that could change everything?