"Birds of a Feather" is the eleventh episode of Durarara!!x2 Ten and the fifty-first episode overall of the Durarara!! anime.
Kadota is the victim of a hit-and-run… The rumor spreads like wildfire around Ikebukuro, and Togusa and Yumasaki set off to find the culprit. Shuji Niekawa, who's been running around trying to gather information on the Dollars, comes into contact with Shiki. Akabayashi, who’s hired Izaya to investigate Mikado, is about to make his next move. And Aoba, hoping to take the Dollars to the next level, sets his sights on a certain person.
adapted from what manga or LN chapter?
references to previous episodes?
In order of appearance (not including OP)