In the cold, fractured landscape of post-reunification Germany, Dr. Kenzo Tenma, a surgeon of unmatched skill, makes a fateful choice to honor his conscience over hospital politics by saving a young boy with a gunshot wound to the head. This act of mercy backfires years later when the boy, Johan, re-emerges as a charismatic architect of chaos and serial murder, forcing Tenma into a life as a fugitive to undo the "life" he granted. The narrative evolves into a sprawling psychological epic that interrogates the origins of evil and the possibility of maintaining one's humanity when staring into the abyss. It is a hunt not just for a killer, but for the answer to whether any human being is truly beyond the reach of grace or if some are born as "monsters" beyond repair.