紐約。有著非凡的姿容,和卓越戰鬥力的少年·亞修。統領街頭幫派的他聽到了,被手下所殺的男人在臨死之際說出的“BANANA FISH”的神秘話語。與此同時,他與作為攝影師的助手來取材的日本少年·奧村英二相遇。兩人決定一同追尋“BANANA FISH”之謎——
福岡乍看是個和平的城市,背地裡卻是龍蛇混雜、犯罪蔓延,有錢有權就能買到人命,已成殺手業的激戰區,甚至還有專殺殺手的殺手存在的都市傳說。
熱愛博多與棒球的私家偵探、有女裝癖的黑道組織殺手、走投無路的殺人承包公司新進員工、天才駭客情報販子、美麗的人妖復仇專家、替市長剷除異己的殺人行家……特立獨行的他們,被捲入市長大選中,糾葛不清。
以人命堆疊的陰謀背後,真相究竟是──
一旦惡行逾越界線,「殺手殺手」便會現身!
能夠在殺手城市──博多活下來的會是誰?
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.