"Underworld 8" is the eighth work of the "Underworld Women" series starring Furukawa Iori. At the beginning of the story, Yida, the president of Yida Painting Company, was found dead. With this incident, the drug deal was exposed by the police. At the same time, the weapon that attacked Yitian was found from the Puhu organization, and Tetsuya was also arrested. Suspicious of this, Maki starts her own independent investigation..
In "The Girl in the Underworld 8", Maki launches a personal investigation to uncover the truth. She was very suspicious of Yi Tian's death and decided to find out the truth by herself. By investigating and collecting clues, Maki gradually discovered the complicated relationships and conspiracies hidden behind her.
As the investigation deepened, Maki discovered that the source of the murder weapon was related to the Puhu organization. She began to wonder if someone deliberately put the blame on Tetsuya, and tried to find out who was behind it. Maki's independent actions attracted the attention of the police and gang organizations, and she had to face various obstacles and dangers.