"Babylon" is a psychological thriller manga written by Mado Nozaki and illustrated by Tetsuya Tsutsui. The story is set in the fictional city of Fukuoka, where a new district called Shiniki is established as a special administrative zone. The narrative centers around Zen Seizaki, a public prosecutor investigating a pharmaceutical company suspected of falsifying clinical trial data. During the investigation, Seizaki uncovers a series of disturbing events tied to a mysterious woman named Ai Magase, who appears to be orchestrating a larger, more sinister plan.

As the plot unfolds, Seizaki discovers that Magase possesses an uncanny ability to manipulate people into committing heinous acts, including suicide and murder, without direct coercion. Her influence spreads like a contagion, destabilizing society and challenging the boundaries of law and morality. The investigation takes a darker turn when Seizaki learns of a clandestine project called "Babylon," which aims to redefine the concept of life and death by legalizing suicide and euthanasia on a societal scale. This project is tied to the political ambitions of Kiyosaku Sekuro, a powerful figure in Shiniki, who seeks to use it as a tool for control.

The story delves into themes of free will, ethics, and the nature of evil, as Seizaki grapples with the moral implications of Magase's actions and the broader societal consequences of the Babylon project. Supporting characters, such as Seizaki's colleague Atsuhiko Fumio and journalist Hiasa Sekuro, play pivotal roles in uncovering the truth and confronting the chaos unleashed by Magase. The narrative is marked by its tense pacing, intricate plotting, and exploration of philosophical questions, making it a thought-provoking and unsettling read. The manga concludes with a climactic confrontation that leaves the fate of the characters and the city hanging in the balance, challenging readers to reflect on the consequences of humanity's darkest impulses.