There is and none has been announced.
While there are valid reasons to believe that a second season could happen, there are also some challenges to consider: banana fish season 2
To understand the discourse around a second season, one must first acknowledge the definitive nature of the first. The anime is a faithful, albeit condensed, adaptation of the 19-volume manga series released between 1985 and 1994. The 24-episode run covers the entire timeline of Ash Lynx’s war against the Corsican mafia, the mystery of the drug "Banana Fish," and his relationship with the Japanese photographer’s assistant, Eiji Okumura. By the time the credits roll on the finale, the central conflict is resolved. The villain is defeated, the conspiracy is dismantled, and the hero finds peace—albeit at the ultimate cost. Structurally, the story does not require a continuation. To force a sequel would be to violate the narrative integrity of a story defined by its singular, tragic conclusion. There is and none has been announced