Inspector Heinrich Lunge (ハインリッヒ・ルンゲ) is the main deuteragonist of the series, He is an officer employed in the BKA, who obsessively believes that Dr. Kenzo Tenma is responsible for a series of murders and criminal events taking place in Germany, and doggedly pursues him to that end. He lives for his work, and pridefully states that no case he ever has taken on has ended without a resolution. He possesses extremely high analytical abilities, and has an excellent memory. However, he is ultimately forced to confront and contend with the "fairy-tale" reality that surrounds him when he comes to realize that Tenma is not in fact responsible, but no less than the mysterious Johan Liebert, the "monster" Tenma had referred to in his testimonies, is in fact the guilty party.

Monster
Dr Kenzo Tenma is a genius surgeon working in post-Cold War Germany who has a bright future ahead of him. He is admired by his colleagues, loved by his patients, and due to marry his boss' daughter, the beautiful Eva Heinemann. One day, when two patients in desperate need of emergency surgery are wheeled into his hospital, Tenma faces a terrible choice of saving the orphaned boy who came first or the mayor of Düsseldorf, whose recovery would raise the hospital's profile and boost his own career. Against the demands of his superior, Tenma does what he believes is right and saves the child. However, his decision not only damages his prospects, but unleashes a chain of events so horrific that it might have come from the depths of his worst nightmares. Laden with guilt, Tenma begins a journey across Germany in search of a formidable young man who will challenge his morals, his love for life, and his very sanity.