Shoujo Kumichou Ririka no Shoukan Keiei-ki

Protagonist Ririka was just a regular schoolgirl. Until a few weeks ago, that is. Her father, an underworld crime boss, died, and left the family business to her. With no time to mourn, she was thrust into a world of bloodthirsty yakuza, huge loan payments, and more... The path she chose to deal with this: ruthlessly managing a brothel and adult film business. Working in a world of crime, she coldly takes advantage of unfortunate women, and uses them to raise the capital she needs! What will await Ririka at the end of all this, prosperity, or ruin...?