Durarara!! Yellow Scarves Arc, Vol. 3 - manga

"That's why I'm Here."
To face the past and protect the present, Masaomi Kida, leader of the Yellow Scarves, heads to Izaya's apartment. His intention is to discover the true identity of the leader of the Dollars, but what he finds shocks him to his core! When the Yellow Scarves, the Dollars, and the followers of Saika all gather in one place, three best friends must confront the greatest challenge to their friendship...