While hanging out with Anri, Mikado and Kida learn about her worries for her missing friend and try to cheer her up. Later the duo gets themselves in trouble when they are cornered by a gang of thugs.

Shizuo Heiwajima, also known as “the strongest man in Ikebukuro”, is a man who definitely relishes that title. Though he carries with him a high esteem, something is amiss. Lately he has been extremely short-tempered and does not know why.

Anri's missing friend, the Dullahan, the girl with the scar on her neck, Yagiri Pharmaceuticals, the kidnappings, and the Dollars... little by little, the pieces begin to fall into place.

As Anri faces off against Haruna, truths about her past are revealed. Elsewhere, Shizuo fights an unending battle against the Slashers in South Ikebukuro Park. As he defeats them one after another, his expression starts to take on a hint of joy.

Anri notices something is wrong with Masaomi, and takes action to find out what it is. Elsewhere, a gang-war breaks out between the Yellow Scarves and the Dollars over the Slasher’s identity. The standoff grows as Mikado’s desire to stop it is ignored.

Filled with unwavering determination, Masaomi enters the abandoned factory, and encounters the unexpected. At last: Masaomi, Mikado, and Anri face off. Although each of them carries inexpressible feelings, they eventually find an answer...

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!