Death Note is about a high school student named Light Yagami who finds a mysterious notebook called the “Death Note.” When he writes someone’s name in it, that person dies. Light decides to use it to kill criminals and create a perfect world under his rule as “Kira.” However, a genius detective known only as L starts investigating these deaths to catch Kira. This leads to an intense psychological battle between Light and L, as both try to outsmart each other. The anime explores themes of justice, power, and morality.