Durarara!! Yellow Scarves Arc, Vol. 2 - manga

The Yellow Scarves are threatened when an unknown individual infiltrates their hideout. Just when the Yellow Scarves have their quarry cornered, the Headless Rider, urban legend of Ikebukuro, comes to her rescue. The incident leaves the entire neighborhood unsettled once again, and the resulting turmoil forces Masaomi Kida, leader of the Yellow Scarves, to come face-to-face with the painful past from which he once fled...