The Reaper Princess Saves the Day

Luna eats dark aura, and she has got through so much of the Underworld's supply that there is next to nothing left in it. Lord Hades rules the place and he is her father, and he sends her up to the mortal world to get some experience and learn to behave. She picks her mortal father herself, a CEO born under the Imperial Star Fortune who is cold with everyone and now has a small girl calling him Papa. The house is full of dark aura, and it is in the CEO and his sons as well. Luna sets about clearing it out of them. There are people working against the family, and she breaks up what they have arranged, using her own magic and causing a good deal of disorder in the house she has moved into.