In the aftermath of the Sky Casino's fall, Kunikida is faced with a terrible choice. Ango, Atsushi, Lucy, and Kyouka dig deeper into the secrets hidden within Atsushi's memories, and Rampo proves his worth as the world's greatest detective.

As Fukuchi allies with plans to create an international anti-terrorist organization targeting Gifted, Atsushi and Rampo appeal to him for help. Rampo turns his immense detective abilities to the question of Kamui's identity, and the truth will change everything.

Atsushi and Akutagawa find themselves cornered, with no choice but to fight Fukuchi and his seemingly insurmountable powers. Combining forces and trusting in one another, do they have what it takes to defeat the mightiest Hunting Dog?

Loyalties continue to be tested as the depth of Fukuchi's betrayals become clearer. Tachihara is forced to make a choice between the Port Mafia and the Hunting Dogs, and he may be the only one left who can stop Fukuchi before it's too late.

The Detective Agency races to stop Fukuchi from receiving the One Order, a devastating mind control weapon that will make his plans for world domination unstoppable.

Fukuchi's plans and the Agency's attempts to thwart him escalate, and Aya comes face to face with Count Bram. Meanwhile, Nikolai and Sigma move to rescue Dazai and Fyodor from prison, but Nikolai has more than rescue on his mind...

As Atsushi races to find Teruko, Kenji arrives to help Aya and Bram escape the airport.

Kenji fights to help Atsushi, demonstrating why he is one of the most dangerous Agency members. Meanwhile, Dazai's machinations within the prison become clearer.

Fukuzawa and Fukuchi confront their shared past as time runs out for the Detective Agency.

Dazai and Sigma are trapped in a flooding room. Atsushi is attacked by Akutagawa when he attempts to help Aya. During their fight Aya desperately tries to remove the holy sword from Bram.

The final pieces of Fukuchi's plot snap into place, trapping Fukuzawa in a way not even Rampo could anticipate. At the same time, Fyodor and Dazai's deadly game draws to a close.