"Chaos;Child" is a psychological thriller anime set in Shibuya, Tokyo, six years after a series of mysterious murders known as the "New Generation Madness" incidents. The story centers on Takuru Miyashiro, a high school student and president of the school newspaper club, who becomes entangled in a new wave of bizarre killings that mirror the events of the past. These murders, dubbed the "New Generation Madness Revival," spark Takuru's curiosity, leading him to investigate alongside his friends and club members.

Takuru's investigation reveals a connection between the murders and individuals known as "Gigalomaniacs," who possess the ability to manipulate reality through their delusions. As the group delves deeper, they uncover a conspiracy involving a secretive organization called the Committee, which has been conducting experiments on Gigalomaniacs. Takuru's own latent abilities begin to surface, blurring the line between reality and illusion, and forcing him to confront his traumatic past.

The narrative explores themes of trauma, identity, and the consequences of unchecked power. Key characters include Serika Onoe, Takuru's childhood friend and a central figure in the unfolding mystery; Nono Kurusu, a journalist with ties to the original New Generation Madness cases; and Hinae Arimura, a classmate with her own connection to the Gigalomaniac phenomenon. The story builds tension through its intricate plot twists, psychological depth, and the moral dilemmas faced by its characters as they navigate a world where perception and reality are constantly at odds.

The anime adaptation condenses the source material from the visual novel, maintaining its core mystery and emotional weight while focusing on the psychological struggles of its protagonists. The series balances its dark, suspenseful tone with moments of character-driven drama, creating a compelling narrative that keeps viewers engaged until its climactic resolution.