Three stories about the investigator Mishima, called the Death Note otaku, who encounters a case where a former criminal died of stroke and he closes in on the truth; L's successor, the famous international sleuth Ryuzaki who has solved numerous difficult cases, decides to assist in a Death Note case that he has continuously refused despite repeated requests; and cyber terrorist Shien, who became a follower of "Kira" after he was set free from the trauma of being the only one who survived the brutal murder of his family, attempts to use the Death Note for the first time.