The Jadeite Within the Jadeite Case

In the Emerald Jade Underworld, there has never been loyalty or righteousness, only people dying for wealth and birds dying for food. For money, no one here is a person. Everyone is a pawn. My father forbade me from entering the underworld, but the day after he died, my senior sister disappeared. She left me only one message: Someone has to avenge Father. When I come back, I'll be your wife and give you a whole bunch of chubby boys. I have to find my senior sister, and I have to avenge Father myself! I... am entering the underworld!