Banana Fish (2018)

Twelve years ago, multiple Americans serving in Iraq died mysteriously. There, Griffin Callenreese killed several of his comrades in a spree, muttering the words “Banana Fish” until he finally collapsed. His younger brother Aslan, on the other hand, has made himself a name on the streets of New York. Nowadays known as Ash Lynx, he is leading an infamous street gang. After a ruthless childhood, the handsome and charismatic adolescent is now as clever as he is deadly. His connection to the cruel mafia boss Dino Golzine, by whom Ash was kidnapped and forced into prostitution, also helped him gain power.

One day, an unknown man hands Ash a cartridge case containing a mysterious drug. Not long after this, the man dies. As they become more frequent, the mysterious suicides, as well as the incident from twelve years ago surrounding his dead brother, gradually come into focus. Becoming aware of the events, a Japanese journalist and his 19-year-old assistant Eiji Okumura decide to make their way to the city. However, they quickly recognise the connections between the latest incidents and the boy called Ash Lynx …

Source: www.anisearch.com/anime/12939