In Death Note, Ryuk, a shinigami, drops his Death Note into the human world for amusement. In Japan, Light Yagami, a brilliant high school student, discovers the notebook. It contains a rule: anyone whose name is written inside will die. Initially skeptical, Light tests the power by writing a criminal's name, and the criminal dies.
Seeing the Death Note's potential, Light begins a systematic campaign to eliminate criminals under the alias "Kira," aiming to create a utopian society free of evil. As the killings draw attention, the police turn to L, a renowned detective, to uncover Kira's identity.
Death Note unfolds as a tense psychological battle between Light and L, with humanity's future at stake.