After a year in the Port Mafia, Chuya Nakahara aims for an executive role. However, his ambitions face a threat when a man named Paul Verlaine, claiming to be his younger brother, emerges with a deadly agenda. To protect his loved ones, Chuya partners with Adam, a European A.I. detective, to thwart this impending danger and prevent Yokohama from descending into chaos once more.