Durarara!!: Manga Series by Ryohgo Narita, Suzuhito Yasuda

If you see Shizuo Heiwajima, don't wait around. Run!! Mikado is an average high-schooler whose life has been anything but since moving to Ikebukuro! After coming face to-neck?-with the legendary 'Headless Rider,' Mikado can hardly wait to encounter more of the city's peculiar residents. But when Mikado is caught in the middle of a feud between Izaya Orihara and Shizuo Heiwajima, he soon realizes that Ikebukuro's most unbelievable characters are also among its most dangerous...

Twisted passion accelerates disaster!! After twenty years of searching, Celty, the headless Black Rider, has at last found her missing head-bobbing through the streets of Ikebukuro on someone else's neck! Though Celty pursues, the girl escapes on the arm of Mikado Ryuugamine, taking refuge in his apartment. But with both the legendary Rider and Yagiri Pharmaceuticals bearing down on Ryuugamine in their pursuit of the scarred girl, how can he hope to save his own neck?!

Dollars, rise up!! When Yagiri Pharmaceuticals crosses the line, the true leader of the Dollars steps forward to take command of the vast network of members at his disposal…Though this unobtrusive boy holds a disturbing degree of power in the palm of his hand, Celty is preoccupied by the powers that still control her head…At the end of the day, will her twenty-year search all be for naught? Or has she found something even more precious along the way?