The person who got the Death Note dropped by Luke the Grim Reaper was a Japanese high school student named Light Yagami. Light wrote the names of criminals in the world into the notebook and killed them. He believed that such an act would be justice and vowed to turn the world into a new world without criminals, and he would be the god of this new world. The common people who found out that someone was punishing criminals began to call the punisher KIRA (KIRA is the Japanese pinyin of Killer, which means killer). On the other hand, ICPO (Interpol), which noticed the appearance of KIRA, commissioned a detective named L to investigate the KIRA incident. L is the only one who can mobilize police from all over the world. Many of the deadlocked cases in the world were solved by him. No one knows his real name, appearance, place of residence, etc. L, who believes that KIRA is a criminal, uses a clever and bold way to prove that KIRA is in the Kanto region of Japan and sets up a search headquarters in Japan to challenge KIRA. From then on, KIRA and L started a series of battles of wits to reveal each other's true colors and for each other's justice.