Babylon is a psychological thriller anime series that follows Zen Seizaki, a dedicated public prosecutor in Tokyo. While investigating a case of illegal clinical research involving a pharmaceutical company, Seizaki discovers a mysterious blood-stained document containing hair and skin samples, along with the letter 'F'. As he digs deeper, he uncovers a massive conspiracy that reaches the highest levels of the Japanese government and the upcoming election for a new autonomous zone. At the heart of the mystery is Ai Magase, a manipulative and enigmatic woman who possesses the terrifying ability to influence people's minds, driving them to commit suicide or act against their own morals. As Seizaki struggles to maintain his sense of justice, he is forced to confront the philosophical implications of 'good' and 'evil' in a society that is rapidly descending into chaos. The series is a dark, high-stakes exploration of ethics, political corruption, and the fragility of human willpower.