Series by 梶山ミカ

Sakura, a high school girl with a passion for cleaning, finds herself suddenly transported to a fantastical world where magic reigns—but there's a catch: "cleaning magic" is forbidden by a powerful curse. She lands in the heart of the Demon King's castle, a place ruled by the handsome yet lazy Demon King and plagued by unimaginable filth. Unable to resist her cleaning instincts, Sakura picks up a broom and discovers her skills can tackle even the most stubborn grime. As she transforms the castle and its surroundings, Sakura's cheerful determination begins to change the lives of the demon realm's quirky inhabitants.