I Was Loved by No One, so Mopping the Floor Turned It into a Sacred Sanctuary

Stella was never given the love of her family, nor the skills bestowed by God. After her fiance's heart was stolen by her younger sister, she rushed to a convent. She discovered the joys of cleaning and ended up becoming a maid for the troubled prince Cecil, who is holed up in a room filled with miasma. Before she knew it, she had acquired the skill of "purification"—and combined with his "destruction" skill, she transformed magical beasts into fluffy, holy beasts! Is there a secret behind Stella's origins?!

(Source: Gaugau Monster, translated)