The light novel series Durarara!! written by Ryohgo Narita and illustrated by Suzuhito Yasuda is first published.
Announcement that the Durarara!! light novel series will receive an anime adaptation.
The first season of the Durarara!! anime television series premieres in Japan.
The Durarara!! anime season 1 is released on Blu-ray and DVD.
Announcement of a sequel anime adaptation, Durarara!!x2, adapting further story arcs from the light novel.
Durarara!!x2 begins airing in three cours: Shou, Ten, and Ketsu, continuing the anime story.
Mikado Ryugamine transfers to Raira Academy and moves to the city of Ikebukuro, seeking excitement away from his rural hometown.
Upon arriving in Ikebukuro, Mikado is reunited with his childhood friend Masaomi Kida, who introduces him to the city’s underworld.
Mikado and Masaomi meet Celty, the headless rider, who searches for her missing head while working as an underground courier.
An anonymous online group called the Dollars gains traction in Ikebukuro, consisting of various individuals seeking to change the chaotic dynamics of the city.
Anri transfers to Mikado's school and struggles with her secret past and her role as a wielder of the Saika blade.
Anri's cursed Saika blade begins influencing her and attracts other cult members, bringing violent confrontations to Ikebukuro.
Mikado discovers the complexities behind the Dollars gang and its impact on Ikebukuro's underground politics.
Rival gang wars erupt between the Yellow Scarves, a Chinatown group, and the Blue Squares, a local Ikebukuro gang, destabilizing the city.
The information broker Izaya intensifies his schemes, manipulating various factions in Ikebukuro for his amusement and agenda.
Shizuo, known for his immense strength and short temper, confronts gang conflicts trying to maintain order in Ikebukuro.
Celty continues her quest to find her missing head and uncover her past as a Dullahan in modern-day Ikebukuro.
Mikado is revealed to be the anonymous founder and leader of the Dollars, changing perceptions of his character.
Multiple groups, including gangs, supernatural beings, and the Dollars, face off in battles that decide the control of Ikebukuro’s streets.
The Saika cult is disbanded after confrontations, and Anri deals with her trauma and accepts her identity.
Having found some answers, Celty elects to remain in the city she has come to see as home, continuing her courier work.
