The film begins with the main character, Yuuji, being fired from his yakuza syndicate. Soon he finds work for another boss solely as a pay-per-hit assassin, killing members of other syndicates. His life starts to become more complicated when an ex-girlfriend or hooker drops his son off at his house. His son, who is mute, begins to follow him, where the boy watches him shoot a man who is having lunch with his wife and infant son. Afterward, the boy follows Yuuji to a whorehouse where he waits outside. While waiting, he eats food from the garbage and befriends a puppy who is chained in the alley.