The Death Note challenges traditional notions of justice by introducing a supernatural tool that allows its user to pass judgment on others by causing their deaths, regardless of any legal or moral processes. This power gives the individual wielding the Death Note the ability to act as judge, jury, and executioner, bypassing established systems of justice and raising questions about the morality of such absolute power in the hands of one person. The series also explores themes of moral ambiguity, the consequences of playing god, and the potential for corruption when justice is taken into the hands of an individual.