Durarara!!

Among the strange and dangerous mysteries in Ikebukuro one stands out: the urban myth of the Black Rider.  High School student Mikado Ryugamine moves to this downtown area of Tokyo, eager to experience the wonders of the big city.

With best friend Masaomi as his guide, Mikado soon finds that witnessing the Black Rider was merely the beginning of a kaleidoscope of crazy encounters beyond his wildest dreams.