Koichi Nakajima

After five years of service as a cop in San Francisco, Shunsaku Kudo becomes a private detective.

An assassin trained as a ninja carries the code name M. Hayami is a yakuza boss and a divorced father who is not allowed to come near his young daughter Mutsumi from his ex-wife Kazuko. In the big port city of Yokohama, M targets Hayami, who has angered the president of his group.

The story of a second rate detective asked to tail a mysterious woman who is cheating on her man.