Half a year has passed. The city of Ikebukuro seemingly remains unchanged, but foreign elements are slipping in, the serial killer known as “Hollywood” being one of them. The fuse to a new series of events begins to smolder!

Due to her appearance on TV, Celty Sturluson has gained even more attention and 10 million yen is being offered to uncover her identity. Meanwhile, Raira Academy welcomes its new students, which includes Mairu and Kuriri, Izaya Orihara’s sisters.

The idol Ruri Hijiribe and actor Yuhei Hanejima; two people who, despite being hugely popular, remain a mystery. A chance meeting gives them reason to reveal their secrets to one another. Meanwhile, the various situations in Ikebukuro begin to intersect.

While transporting some mysterious luggage, Celty attempts to escape the biker gangs out to claim the 10 million bounty that’s been placed on her. Caught up in the chaos, Mairu and Kururi join with Kyohei and the others.

One night, Mikado Ryuugamine accepts an invitation to Shinra Kishitani's apartment, eager to talk to Celty as quite some time has passed since the two last spoke. But, much to his astonishment, he finds that a large group of Ikebukuro's finest has gathered there for a hot pot party.

Already confused with the current situation, Mikado is further surprised to see that his friend and fellow Raira Academy student Anri Sonohara is there as well. As the two decide to take a seat together, a few members of the group begin reminiscing over events from days past: Mikado recalls an adventure from his childhood with Masaomi Kida, Anri explains how she came to be friends with Mika Harima, and Shizuo Heiwajima tells of his first meeting with Tom Tanaka.

With the uproar over the bounty settled, the city appears to be peaceful. However, the sparks of a new uproar begin to light, one after another. The womanizing leader of the Toramaru gang visits Shizuo, and Celty receives a request from the Awakusu…

A sudden attack strikes Celty. Shinra waits at home for her return, unaware of what’s happened, and is visited by Shizuo, who brings along the mysterious young girl. Mikado hears of a bad rumor about the Dollars and starts trying to figure out the truth.

Two killers in the Russian wilderness discuss the fugitives that have violated their unwritten law. After fleeing the company, Varona and Sloan act as hitmen in Japan. Dennis and Simon watch on as Egor, the “Philosophical Killing Machine” gives chase.

Masaomi contemplates friendship as he travels far from Ikebukuro. Mikado receives an unexpected visit from Aoba. Akane explains the real intention behind her attempt to kill Shizuo. And as Toramaru retaliates against the Dollars, Chikage confronts…

Aoba continues to urge Mikado to become the leader of the Blue Squares. Varona and Sloan, meanwhile, maintain their pursuit of Celty as the Awakusu group searches for both Akane and Shizuo.

Akane grew up loved by her family, wanting nothing. When she learned the truth behind the family business, it was Izaya that reached out to her. In the present day, the conflict intensifies between the Dollars and Toramaru, as Kadota and Chikage face off.

As Izaya’s scheme exposes Chikage’s girlfriend to danger, Mikado attempts to stop the cruel reality caused by a runaway Dollars. Meanwhile, Akane returns home with Celty, but the conflict over Akane seems destined to converge…

The flashpoints that had been smoldering in several places unleash major mayhem, swallowing the city of Ikebukuro. In this mayhem, Mikado’s answer is given.