Durarara!! (Manga)

"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 Orimara and Shizuo Heiwajima, he soon realized that Ikebukuro's most unbellievable characters are also among its most dangerous."

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.