Durarara!! Yellow Flag Orchesta Arc Series by Akiyo Satorigi, Ryohgo Narita

The serial slashings in Ikebukuro have come to an end, and Anri is steadily recovering from her injuries. But life is far from "back to normal" for Kida. Enraged at the random violence that has shattered the peace of his neighborhood, Kida and his middle school crew, the Yellow Scarves, reunite to address the rise of organized gangs in town-the Dollars, the followers of Saika, and now the Yellow Scarves. When all is said and done, who will hold the power on the streets of Ikebukuro?

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...

Masaomi heads to Izaya's apartment in order to discover the true face of the leader of the Dollars, but the truth that he finds there shocks him to his core! The continuation of the Yellow Scarves arc delivers the greatest challenge to Mikado and Masaomi's friendship yet!