Death Note Vol 1 - Boredom

When high school student Light Yagami finds a notebook called the "Death Note", which gives him the ability to kill anyone he recognizes by sight by simply writing their name in it, he begins mass murdering criminals to create a world free of evil and to eventually become its god. Light meets the owner of the Death Note, a Shinigami named Ryuk, who allows Light to use the notebook under his watch. When law enforcement and the public realize someone is committing the killings, they nickname the unknown killer "Kira". The Japanese National Police Agency or "NPA", with the aid of a mysterious detective known only as "L", search and set traps for Kira. When L deduces Kira can kill those whose faces and names he knows, some of the investigators drop out in fear of their lives. L asks for the FBI's help to investigate the NPA members, suspecting that one of them may be related to Kira. An FBI agent watches Soichiro Yagami, Light's father and one of the investigators, along with his family. Light catches on and uses his Death Note to learn the name of the agent.