I Was Loved by No One, So Mopping the Floor Turned It into a Sacred SanctuaryDare ni mo Aisarenai no de Yuka wo Migaite Itara Soko ga Seiiki-ka shita Reijou no Hanashi; 誰にも愛されないので床を磨いていたらそこが聖域化した令嬢の話

Stella was never given any love from her family or any skills given by God. When her sister loses the heart of her fianc and she runs away to a monastery, Stella awakens to the joys of cleaning and becomes a maid to Cecil, a prince with a reason to stay in a room filled with a noxious gas! Before she knows it, she has acquired the skill of "purification" - a skill that, when combined with his "destruction" skill, transforms a magical beast into a fluffy holy beast! Stella, who possesses such saintly powers, has a secret about her origins...?