There is only one world, and it is false, cruel, contradictory, corrupt, meaningless (...). We need to lie to win this truth, that is, to live (...). The metaphysics, morality, religion, science (...) are taken into account just as many ways to lie: with your contribution if it is believed in life.

Naoki Urasawa (Pluto, 20th Century Boys and Billy Bat), through its unquestionable resources, develops Monster in a dual premise, which we can consider as manichean. This challenges the moral behavior of the characters. On the one hand, Tenma, "the doctor", on the other, Johan, "the depravity", dueling in an paradoxical ideological confrontation.

Monster gives real meaning to the definition of psychological gender, your plot investigates into the human mind, their fears and their anxieties. The plot grid its complex, their dialogues and characters tend to a surrealism, which, until then, can hardly be found in this manga genre.

Johan is a cold character, his personality is demonstrated as being logical, fascinating, above all, human and rational. It demonstrates the nature of man in the most cruel, harmful and true form, with an approach somewhat selfish and devastating. Their moral complexity is amazing, being an extremely intriguing character with a horrific and obscure past.

Tenma, the protagonist follows a nonexistent morality made to make bearable the world of life. It is intrinsic to his moral training as a doctor, give value to life, but even that does not realize that behind this morality is lying to the world, but in this perspective it is a fact, after all, he only believed, and so wanted it to be. In the end, all is interpretive, Tenma is attached to ideas that transcend and thus only exist in your conscious. One morality chain. If comes up in your mind the real worldly nature, he would see that their morale its nothing more than an interpretive makeup world and that the true nature of the world its cruelty.

The end is the great moral/lesson of Monster. What happened with Johan? Their nature prevailed again? Was seeking revenge? The questions doesn't need answers because to Tenma, kill or not Johan, no matter, both choices would be made based on moral interpretations: either to favor his revenge or his duty.