Durarara!! (デュラララ!!) is the first light novel of the series. It was published on April 25, 2004, and is 347 pages long, divided into 11 chapters, and includes a prologue and two epilogues. It was released in the U.S. on July 21, 2015, as part of the Yen On imprint.
The first light novel was adapted in the first story arc, the Dollars/Mika Harima arc, consisting of episodes 1-12 of the first season of the anime.
Mikado Ryuugamine, a high school boy looking for the extraordinary, moves to Ikebukuro, Tokyo, at the invitation of a childhood friend. Celty Sturluson, an Irish dullahan, rides the streets of Ikebukuro on a silent, pitch-black motorcycle, searching for her missing head. An information broker watches the people and scenes surrounding him with interest. A girl with a scar on her neck is running from something. Undocumented immigrants are going missing while the group trafficking them has ties to higher figures. A mysterious gang called the Dollars is the subject of countless rumors around the city. All of these stories come together in a few days in Ikebukuro.
- Chapter 1: Shadow
- Chapter 2: The Headless Rider, Objective
- Chapter 3: The Headless Rider, Subjective
- Chapter 4: A Regular Day in Town, Noon
- Chapter 5: A Regular Day in Town, Night
- Chapter 6: Yagiri Pharmaceuticals, Upper Management
- Chapter 7: Yagiri Pharmaceuticals, Under-Under-Underlings
- Chapter 8: Double Heroine, Sonohara
- Chapter 9: Double Heroine, Wounded Girl
- Chapter 10: Dollars, Opening
- Last Chapter: Dollars, Closing
- Epilogue: Ordinary Days, Light
- Epilogue: Ordinary Days, Dark