After her father is murdered by the secret organization Evil, the young martial artist Feilin begins an undercover investigation as an international detective to uncover Evil's conspiracy. From Joe, a Japanese fighter, she learns that Evil has been recruiting elite warriors from around the world. That night, she is attacked in her hotel by Diablo, a masked claw-wielding man. Realizing her identity as an investigator has already been exposed, she refuses to back down. However, she is suddenly ambushed by Ivanoff, a massive pro-wrestler and Evil's assassin. Despite desperately defending herself, she is overwhelmed by his brute strength and knocked unconscious. Feilin awakens in Evil's fighting arena, where Diablo awaits—hired to confront her, driven by twisted desire. Her clothes are torn by his claws, she is punched and kicked, yet she remains determined to face him. At that moment, Evil's leader, Victor Mao, appears, halting the private battle and immobilizing her with psychic force. Will Feilin avenge her father? What is Evil's true purpose in gathering fighters worldwide? BAD END