Above the clouds stands the legendary holy country of Misranda. The "fairy spirit" Lumien living among them was tired of the rigid dogma of the seminary, but a curious touch threw him from the eternal city of light into the lower world of mortal world, which was regarded by his compatriots as the "filthy abyss".
Lumien, who fell into the mortal world, was "picked up" and brought home by a strange girl. Cecilia, a wandering saint blessed by the Nine Holy Spirits and possessing the terrifying power of "one man as an army", is currently worried about next month's rent and food expenses. Seeing this "trouble from heaven" who was richly dressed, elegant and penniless, a "genius" debt repayment plan took shape in her mind - to accept him as her younger brother!
As a result, the noble "fairy" who fell from the clouds was forced to sign a "contract of sale" to work for the impoverished and violent saint. Starting from scrubbing hard bread that can be used as a weapon, Lumine's path to survival (repaying debts) in the mortal world is full of unexpected "surprises".
