Monster, created by Naoki Urasawa, is a psychological thriller manga that delves into the dark depths of human nature. The story revolves around Dr. Kenzo Tenma, a brilliant surgeon who saves the life of a young boy named Johan Liebert. However, Tenma soon discovers that Johan is a sociopathic serial killer, and his decision to save him sets off a chain of events that leads to a cat-and-mouse game between the two. With its complex characters, intricate plot, and exploration of themes like identity and morality, Monster is a must-read for fans of psychological thrillers.