Durarara!!

Mikado, a young man longing for something unusual in his life, moves to Ikebukuro at the invitation of his childhood friend Masaomi. Arriving in Tokyo, he begins his new life as a high school student, awed and mesmerized by the new world around him.

It is the Entrance Ceremony at Raira Academy, and the auditorium swells with a varied mix of emotions emitted from the students. Amidst all this is Rio Kamichika: a girl with a notably dark vibe following her.

Masaomi Kida is out about town, fervently trying to pick up girls, while Mikado tags along, feeling a bit confused and bewildered. Various people intermingle throughout Ikebukuro as rumors of the "Dollars" spread.

People throughout the city speak of an urban legend known as the "Headless Rider". A number of people have witnessed it speeding down the streets on a jet-black motorbike. But does anyone know its true form? One man, Shinra, ponders this mystery.

Mikado, Masaomi, and Anri all enjoy some after-school time, while elsewhere, magazine writer Shuji Niekawa makes little progress in his search to find "the Strongest in Ikebukuro."

An increasing number of people have gone missing in the districts of Ikebukuro and Shibuya. However, those missing are people that will not be missed, such as fugitives and illegal aliens. Who will have the nerve to stand up and save these people?

The man known as the strongest in Ikebukuro, Heiwajima Shizuo. Lately he's been short-tempered and he doesn't know why. His senior and partner, Tom Tanaka, tries to calm him down. Celty worries over him, but it doesn't help. What's bugging him? As he wanders the city to try and find out, he reflects on his past...

Celty, anxious and uneasy about being unable to find her head, gets into a quarrel with Shinra and runs away from home. Meanwhile, an exchange student named Shiri wanders the streets of Ikebukuro people "Hello! What are you looking for?"

Yagiri Pharmaceutical's executive director is unable to determine the whereabouts of her beloved younger brother Seiji and contacts Izaya Orihara, the information broker. Meanwhile, Seiji continues to roam the streets of Ikebukuro together with a woman with a scar on her neck.

Mikado runs into the girl with a scar on her neck, being chased by the Headless Rider, and succeeds in safely getting home with her. The next day, two individuals wait for him outside the school gates: the information broker Izaya and the Headless Rider.

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.

Seiji attacks Mikado to get back the girl with the scar on her neck, but the girl tells him the truth. The truth startles both him and Celty. Seiji is too shocked to move, and an infuriated Celty leaves the scene. What answer will they find in it? At the same time, a shadow approaches Mikado as he watches them toyed with by fate. It was the information broker, Izaya.

Six months after the big Dollars meeting, Ikebukuro has at first glance returned to normal. But below the surface, the Yellow Scarves and the Slasher are becoming more active. A shadow approaches, ready to destroy their peaceful days, as the characters are forced to face their past and present.

Anri is attacked by the Slasher. The same night, the user Saika appears in the chatroom, and posts a puzzling message. Mikado, worried about rumors that the Slashers are the Dollars, decides to cooperate with Celty.

Magazine Journalist Shuji Niekawa's unbridled passion is raging. A Russian who runs a sushi shop, the Awakusu organization, an Information Broker, the Headless Rider... He investigates the supposedly strongest man in Ikebukuro: Shizuo Heiwajima.

Anri was the slasher's target. Kadota and the gang happened to see her get attacked and went to save her. Shizuo and Celty joined in, and the slasher was at last defeated and his identity revealed. But their relief lasted only for a moment, as Celty is stunned at the chatroom log she says. At the same time, a certain person visits Anri when she returns home...

Niekawa Haruka leaves to chase Nasujima, who appeared by chance at her house. Anri follows her. As she faces off against Haruna, who's controlling the gang of slashers, truths about her past are revealed. At the same time, 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...

Confusion is starting to descend on the town of Ikebukuro. Izaya grins with an evil smile... everything is going according to plan. Unaware of Izaya's plan, Masaomi is remembering the past in an abandoned building. How he came back here. How a girl named Mikajima Saki still waits for him at the hospital. He remembers the words Izaya once said to him: "You can never run from your past."

Mikado, Masaomi and Anri continue their peaceful everyday life. But Anri realizes that something is wrong with Masaomi, and tries to find out what. At the same time, a gang war starts to break out between the Yellow Scarves and Dollars over the identity of the Slasher. The standoff grows as Mikado's desire to stop it is ignored.

The headless rider, a member of the Dollars, saved someone with a katana. This fact makes the Yellow Scarves even more suspicious that the slasher is a member of the dollars. What's more, Masaomi starts to suspect that the remnants of Blue Square, the gang he once fought, are part of it as well. He visits Kadota's gang to find out the truth.

Masaomi's orders are ignored as the Yellow Scarves begin to hunt down members of the Dollars. Mikado is depressed when he sees a friend of his attacked at wounded, and begins to wonder if the Dollars are really needed at all. Meanwhile, Anri tries to put a stop to the gang war, but only makes things worse...

The Dollars are enraged at the evil deeds of the Yellow Scarves. While watching the member's comments on the BBS, Mikado desperately tries to find a solution. Meanwhile, the Yellow Scarves find the identity of the girl who escaped from their hideout the night of the meeting, and come after Anri. But a surprising group of people step in to save her...

A gunshot sounds in an rainy alley, and a call comes to Masaomi. Mikado heads somewhere with Celty, and when Anri learns the truth she takes off too. In each of their hearts lie trust, doubt, and uneasy. And Izaya smiles as he enjoys the chaos. Everything rushes toward a conclusion...

Filled with resolve, Masaomi burst into the abandoned factory, but there he met someone he didn't expect. At last Masaomi, Mikado, and Anri meet. As each carryies within them inexpressible emotions, they reach an answer... What answer do they come to? And what will be the end of the Gang War that has involved so many of the people of Ikebukuro?