Light Yagami is a brilliant, bored student who finds a black notebook dropped by a shinigami, a death god. Any name written in it, by a person who pictures the face, dies. Light decides to remake the world as its judge, killing criminals by the thousand while the public acclaims an unseen savior called Kira. The killings draw the attention of L, an eccentric detective who never shows his face and rarely loses. What follows is a duel of deduction: two prodigies probing each other through surveillance, decoys, false identities and carefully baited traps, each trying to prove the other's guilt without exposing himself. Police, media and a shadowy task force are pulled into the game, and every clever move narrows the distance between hunter and hunted.
A shinigami, bored in its own realm, drops a notebook into the human world. Whoever writes a name in it while picturing the face causes that person's death. Light Yagami, a top student with a rigid sense of justice, picks it up and starts executing criminals, believing he can scare the world into behaving. The deaths do not go unnoticed: an anonymous detective known only as L takes the case, and the two begin hunting each other.