第 1 集: Mikado 抵達池袋，在遭遇危險人物的同時，他的朋友也向他警告當地的威脅。

Mikado Ryuugamine leaves his country home to attend high school in Ikebukuro with his childhood friend Masaomi Kida. Mikado, wandering around the district with Masaomi, meets Kyohei Kadota, Walker Yumasaki, Erika Karisawa, and Saburo Togusa, who are four of Masaomi's friends. Three kidnappers strategically seize a teenage girl when the leader poses as a businessman. Masaomi tells Mikado never to come to bad terms with Simon Brezhnev or Shizuo Heiwajima. As the three kidnappers wait at an exchange point, a helmeted person on a black motorcycle appears and attacks the leader and supporter. The driver escapes, but he discovers that the motorcyclist is headless when on a chase. When attempting to attack the motorcyclist, the driver is then slashed with its scythe and he falls to the ground. Masaomi later tells Mikado to stay away from Izaya Orihara as well as a gang called the Dollars. Mikado bumps into a redheaded girl, and he notices a scar around her neck. The girl screams and runs away. Mikado and Masaomi watch the headless motorcyclist pass by soon after that. (Source: Wikipedia)

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