Half a year has passed since the Dollars meeting and Ikebukuro seems to have returned to normal. But underground, the Yellow Scarves and the Slasher are becoming increasingly active. Darkness approaches, ready to destroy the days of peace.

Civil unrest begins to descend upon Ikebukuro. Masaomi finds himself in an abandoned building, depressed, thinking about his past: how he ended up back there, and how a girl still waits for him at a hospital.