Alors que l'enquête de l'Équipe spéciale et de L s'approfondit, Ryuk dit à Light que quelqu'un les suit. Light a besoin du nom de l'homme, et Ryuk fait une offre.
Light se rend à Aoyama pour découvrir l'identité du second Kira avant que L ne devienne plus suspicieux, mais Misa Amane, la nouvelle Kira, utilise son don inhabituel pour trouver Light avant qu'il ne la trouve.
Light et Misa se montrent leurs Death Notes, et Light demande à Misa de faire en sorte que son shinigami Rem se débarrasse de L, ce que Misa accepte de faire pour que Light tombe amoureux d'elle.
L's depression causes a scuffle to break out in the new headquarters, and a recent string of CEO deaths has L and Light thinking that Kira may be killing for monetary profit.
Matsuda, the task force member eager to distinguish himself, decides, while assigned to watch Misa, to do a little snooping on his own at the Yotsuba Group's Tokyo headquarters.
The third Kira sets his eyes on Misa after meeting her. While Misa takes a break from meeting the Yotsuba Group, Rem contacts her. Misa is able to see the shinigami, but her memories of being the second Kira do not return.
L and Light, watching from the investigation team building, wonder whom Higuchi (seemingly alone) is talking to. L wonders if it's a shinigami. With Rem beside him, Higuchi - frantic to kill Matsuda - takes "the deal" to become unstoppable.
The team arrests Higuchi for being Kira and causing multiple murders. Inspecting Higuchi's Death Note, team members who touch it abruptly discover that shinigami do exist, and when Light takes the Death Note from L, his memory returns.
Light, his memory recovered, orders Misa to begin killing after Higuchi dies. The Shinigami Rem realizes that everything is going according to Light's plan, and that L will arrest Misa as Kira unless Rem acts quickly.
In trying to retrieve his kidnapped sister, Light learns of two opposing factions trying to take him down, the SPK lead by N and a crime syndicate lead by Mello.
Mello learns some valuable information concerning false entries in his Death Note from its true owner. Soichiro agrees to take on the shinigami eyes to thwart him.
Mello busts into SPK headquarters to retrieve a photograph of himself to make sure he won't be killed by Kira. In exchange for Near giving him the picture, Mello drops an important hint about the Death Notes: some of the rules are fake.
Star newscaster Kiyomi Takada becomes Kira's spokesperson to the world (after Mikami "deletes" Demegawa). She just so happens to have been Light's girlfriend in college. Aizawa's suspicions about Light grow.
Near goes to Japan, allegedly as bait for Kira. Following Light's instructions, Takada asks Mikami to send her five pages of the Death Note. She tells him that he will continue his work in a fake book made to look like the real one.
Aizawa figures out what's going on and tells Near, who already knows about the notes. Near instructs Aizawa to continue watching Light, and then puts in motion a plan to separate Misa from Light.
Mello kidnaps Takada in a daring operation, getting in the way of both Near and Light's plans to set up a meeting between the SPK and the investigation team.
Near, along with the SPK, meets Light and the task force at a warehouse for the final showdown. To everyone's shock, Near reveals that Kira's follower, Mikami, is at the warehouse and is writing everyone's name in the Death Note.
Though Mikami has written all the investigators' names in the Death Note, a minute passes and everyone is still alive. Near seizes Mikami's Death Note, and all is at last revealed.
