Ryuugamine Mikado is a boy who longs for the exciting life of the big city. At the invitation of his childhood friend Masaomi, he transfers to a school in Ikebukuro. Masaomi has warned him about people he doesn't want to cross in the city: a champion fighter, an informant, and a mysterious gang called "Dollars." Nervous from Masaomi's stories, Mikado witnesses an urban legend on his first day in the city, the Headless Rider astride a black motorcycle. From then on, the existence of supernatural cases and a gang called the Yellow Scarves will rise to the surface, and Ikebukuro will pushed to the breaking point.

[Source: Anime News Network]

“6 Months Later…We haven’t changed at all… or it seems….”

Half a year after the turmoil that rocked the entire city of Ikebukuro— Peace has once again returned to the city and people are living each day normally. The high school students enjoy their days of youth as the strongest and most dangerous man of Ikebukuro works diligently. The informant plots a new scheme and the headless rider is pursued by the cops as she rides through the night…But soon this normal will be cut short by the abnormal. Slowly but surely, the unknown will seize the city and face an all new storm.

[Source: Crunchyroll]

Ikebukuro -- a place filled with conspiracy plotters. After an information exchange center has been attacked, a young man who possesses the strength of two color gangs: "Dollars" and "Blue Squares," walks on a path to end the chaos with his own ideologies.

[Source: Anime News Network]

Episode "4.5" of Durarara!!×2 Shou

"Episode 13.5" is set between episodes 13 and 14, and depicts the shocking incident that occurs during Celty and Shinra's romantic trip together. It adapts a popular story segment from the seventh volume of Ryohgo Narita's original novel series.

[Source: Anime News Network]

Final cour of "Durarara!!×2."

The story of an incident involving a fake Shizuo from Numabukuro, Shizuo Nobusuma, who causes chaos in Ikebukuro.

[Source: MyAnimeList News]