In the bustling streets of New York City, Ash Lynx, a young runaway taken under the wing of mafia kingpin Dino Golzine, now leads his own gang at just 17. When Ash delves into the enigma of 'Banana Fish,' the same cryptic words haunting his war-torn brother Griffin, his path is obstructed by Dino's ruthless interference. Amidst the turmoil of an underground bar rendezvous, Ash encounters new acquaintances in the form of Japanese journalists Shunichi Ibe and Eiji Okumura, along with loyal ally Shorter Wong. However, their meeting is abruptly disrupted by Dino's henchmen, resulting in the abduction of Skip and Eiji. As Ash grapples with the challenge of rescuing his friends and pursuing the elusive Banana Fish, his tumultuous past with the mafia looms large, casting doubt on his chances of success.