ข้อมูลอนิเมะDurarara!!

Mikado Ryūgamine leaves his country home to attend high school in Ikebukuro, Tokyo with his childhood friend Masaomi Kida. Three people chat online about current events in Ikebukuro. As Mikado and Kida wander around the district, Mikado meets four of Kida's friends: Walker Yumasaki, Erika Karisawa, Saburo Togusa, and Kyohei Kadota. Elsewhere, a trio of men confirm that their target is a teenage girl. In the chatroom, they discuss the recent mass suicides. A man approaches the girl and leads her to the van, and she is kidnapped. Mikado and Kida encounter Simon Brezhnev, and Kida advises Mikado not to make enemies with Simon. Mikado sees a vending machine fly through the air. Kida explains that Shizuo Heiwajima caused it and warns Mikado to be careful of Shizuo. As the three in the chat room talk about the legendary headless motorcycle rider, the kidnappers wait at an exchange point. A helmeted woman on a black motorcycle appears and attacks them, but one kidnapper escapes. During the chase, he discovers that she is headless. When he attacks her, she slashes him with her scythe and renders him unconscious. Kida tells Mikado to stay away from Izaya Orihara and the Dollars gang. Mikado bumps into a red-haired girl, knocking her down. As Kida helps her up, Mikado notices a scar around her neck. The girl screams and runs away. Soon after, Mikado and Kida watch the headless motorcycle rider pass by. This episode is from Mikado's point of view.

Mikado and Masaomi begin the school year in separate classes. In Masaomi's class is the girl who was kidnapped before, Rio Kamichika, and her background story is revealed, including her encounter with the headless rider.

Anri Sonohara, a classmate of Mikado's become class representative along him. While goofing off with Kida, Mikado spots Anri in trouble and decides to lend a hand to her and coincidentally, getting himself into a clash involving the dangerous Shizuo Heiwajima and his sworn enemy, the elusive Izaya Orihara.

Shinra Kishitani, an unlicensed underground doctor, talks to the headless woman, whose name is revealed to be Celty Sturluson, about her day using a chat room. That morning, Celty learned from Izaya that an old street artist saw a dullahan missing its head. Celty quickly goes to find the man, but cannot find him. Shizuo knows where the artist is and helps her talk to him. However, they find that the artist could not draw the dullahan's head. Shinra tells Celty to give up looking for her head so they can live together forever. Celty becomes upset and leaves. It is revealed that during that morning, Shinra was the man that told the artist that the dullahan was perfect without the head.

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.

The Dollars gang figures that a foreigner friend of theirs was captured by the manhunters and search through Ikebukuro determined to rescue him.

Shizou has been very angry and destroys everything around him. Just as he recalls how he started doing that, his past involving the secret of his limitless strength, his relationship with Shinra as well as his encounter and vendetta over Izaya Orihara is revealed.

After losing contact with his brother Seiji, Namie Yagiri enlists Izaya's help to find him. While roaming through Ikebukuro, Seiji and Mika Harima stumble unto Shizuo and Celty and a heated pursue begins after Celty figures that the head attached to Mika's body is actually hers.

After losing contact with her brother Seiji, Namie Yagiri enlists Izaya's help to find him. While roaming through Ikebukuro, Seiji and Mika Harima stumble onto Shizuo and Celty and a heated pursuit begins after Celty figures that the head attached to Mika's body is actually hers.