Monster, created by Naoki Urasawa, is a psychological thriller manga that delves into the depths of human nature and the consequences of our actions. The story revolves around Dr. Kenzo Tenma, a brilliant neurosurgeon who saves the life of a young boy named Johan. However, Tenma soon realizes that Johan is a sociopathic serial killer, and his decision to save him sets off a chain of events that will haunt him for years to come. With its complex characters and intricate plot, Monster explores themes of morality, identity, and the blurred lines between good and evil.