A world contaminated by mysterious black “miasma.” A cleanliness-obsessed office lady in her 30s is reincarnated as Scarlett Northmark, the marquis' daughter of the Kingdom of Vandel. Realizing that only she can see the spreading “miasma,” she decides: “Then I’ll just have to clean it myself!” What she picks up to fight this threat is… a broom! With her boundless curiosity and cheerful spirit, she sweeps and sweeps and sweeps again—treating it like a game. But one day, she suddenly gains extraordinary magical powers?! The broom is her best friend! This mischievous noble girl sweeps the filth of the kingdom and rises to become a great mage—an epic tale of a cleaning-obsessed heroine!