Storm and Stress
Mikado phones Namie proposing a deal, Namie attends with some followers around. Mikado claims he has Mika and demands the "truth" behind what she has done to Mika, she does (unknown to the viewer) while Kadota brings Mika to Celty at the roof of a building nearby Mikado and Namie. Mikado disguisted by the truth asks Namie to turn herself in, she thinking of Mikado's thoughts as nonsense orders her henchmen to move, however Mikado revealing himself as the leader of the Dollars sends massive-multiple email through his cell phone which is in fact sent towards the large mass of people of Ikebukuro who are in fact members of Dollars, ordered to only stare Namie and her workers. It is revealed that Mikado created the Dollars in hopes to create a rumor which would spread, however his plans were brought down when people calling himself Dollars were doing evil. In desperation Mikado left messages about Dollars being a group to do good, which in fact worked. Just as Namie and her followers are desperate, Celty with a high resolution over her existance caring little if she is seen as a monster, decides to attack the Yagiri workers defeating them, although revealing herself as "headless" causing panic among the people. Just as this happens Seiji in an enranged behaviour decides to attack Mikado knowing he knows where "Celty" is.
Aired 19/03/2010EP 11 - Storm and Stress

Durarara!!
In Tokyo's downtown district of Ikebukuro, amidst many strange rumors and warnings of anonymous gangs and dangerous occupants, one urban legend stands out above the rest—the existence of a headless "Black Rider" who is said to be seen driving a jet-black motorcycle through the city streets.
Ryuugamine Mikado has always longed for the excitement of the city life, and an invitation from a childhood friend convinces him to move to Tokyo. Witnessing the Black Rider on his first day in the city, his wishes already seem to have been granted. But as supernatural events begin to occur, ordinary citizens like himself, along with Ikebukuro's most colorful inhabitants, are mixed up in the commotion breaking out in their city.
(Source: MAL Rewrite)