Ryo Saeba and his partner Kaori Makimura receives a new job assignment in Shinjuku. The client is a model, Ai Shindo, who has been targeted and followed. Ai is a campaign model for the IT company whose CEO, Shinji Mikuni, is the childhood friend of Kaori.

On one hand, Umibozu and Miki received news that the mercenaries are gathering in Shinjuku, and their target is after Ai… While going after the mercenaries, Saeko from the police department discovers a great secret! The massive weapon dealer Vince Ingrado is in Japan, together with the arrival of a new weapon. Will the “City Hunter” be able to protect both Ai and the Shinjuku city!?