Light Yagami, a college student with a genius mind, accidentally picked up the Death Note that was dropped on the ground by the god of death. As his father Soichiro Yagami is the police chief, Light, who has a strong sense of justice since childhood, decided to use the Death Note to purge the world of bad guys and create an ideal world with his own hands. After a series of inexplicable deaths of criminals, people gradually learned that there was a savior named Killa. On the other hand, in order to investigate Killa, ICPO invited a genius boy named L, L. Lawliet, to investigate Killa, hoping to use his genius reasoning ability to find out Killa's true identity. Then, the second Death Note also appeared.