Allies

Allies (連合国, Rengō kuni) is the 6th chapter of Volume five and 40th chapter overall.

Plot
Soichiro responds to L’s request by saying that they will make the decision for themselves. Soichiro, Matsuda, and Mogi all decide to quit the NPA and continue working on the Kira investigation. Aizawa is unsure because he has a wife and daughter that he has to feed, and it’s not in his best interest to be unemployed. He sadly makes the decision that he will go back to the NPA. However, as Aizawa is leaving, Watari asks why L has not mentioned that he has made preparations to make sure every investigation team was financially secure in case they had to quit the police force. Aizawa realizes that L was testing him, and he quits the Kira investigation team in anger.

Two days later, Soichiro notices that the deaths convenient to Yotsuba are concentrated during the weekend. L decides that this is enough evidence to investigate the Yotsuba group thoroughly and calls for some back-up. He summons Aiber, a professional con artist who can convincingly blend in with any group of people and Wedy, a professional thief who can infiltrate any lock and security system in a building.

Conception
The chapter's title "Allies" was chosen because of how the team gained Aiber and Wedy as allies and lost Aizawa as an ally. Ohba had described the title as "ironic."