Vor zwölf Jahren starben mehrere im Irak stationierte Amerikaner auf mysteriöse Weise. Griffin Callenreese tötete in einem Amoklauf mehrere seiner Kameraden und murmelte bis zu seinem Zusammenbruch nur noch die Worte Banana Fish. Sein jüngerer Bruder Aslan wiederum hat sich in der Gegenwart auf den Straßen von New York als Ash Lynx, Anführer einer Straßengang, einen Namen gemacht. Nach einer unbarmherzigen Kindheit ist der schöne und charismatische Heranwachsende nun ebenso clever wie tödlich. Zur Macht verhalf ihm auch seine Verbindung zum Mafiaboss Dino Golzine, der Ash Lynx einst entführte und zur Prostitution zwang. Als eines Tages ein unbekannter Mann Ash eine Patronenhülle mit einer darin enthaltenen Droge in die Hand drückt und kurze Zeit später verstirbt, rücken die mysteriösen Selbstmorde, die sich zuletzt gehäuft haben und das Geheimnis um seinen Bruder mehr und mehr in den Fokus.

Although the city of Fukuoka might look relatively peaceful at first glance, in actuality it houses a thriving mixture of dangerous individuals such as killers, detectives, and professional revenge seekers right beneath its surface. Among their number is Zenji Banba, a laidback and observant detective who is investigating the work of other hitmen companies in the area. However, Banba might not be the only one with a bone to pick with these organizations, as Xianming Ling, a crossdressing male hitman in the employ of one such company begins getting fed up with his lack of jobs and pay.

One day, after Ling's current target commits suicide before the hitman could reach him, his company refuses to pay him even half the amount they were originally supposed to for the assassination. Frustrated, Ling requests another mission and is offered the job of taking out Banba, whom his organization believes has been interfering with their business. However, when Banba arrives at his home and finds the hitman inside, Ling surprisingly doesn't even attempt to kill him. Instead, he offers the detective another option: to join him and form a team. With the offer on the table, exactly how will Banba respond, and just what plans does Ling have in store for the underground world of Fukuoka?

In the shadows of this world, ninjas fight for control of an ancient technique which holds untold strength. This coveted power dwells within apathetic Miharu, a fact the guy really couldn't care less about - until the rival clans bring their battle to him. Now, he must choose a side if he hopes to survive - but when conflict is waged in secret, friend and foe prove difficult to tell apart.