Ash Lynx is the head of a deadly gang in New York City. However, a drug has rendered the mind of his only brother useless. The only word his brother seems to know is Banana Fish. Deciding to take justice into his own hands, Ash decides to rebel against the system that gave him power. At the same time, a timid young Japanese boy steps off a plane that has just touched down in NYC. His name is Eiji Okumura. His fate is closely entwined with that of Ash’s and once the two cross paths, there will be no going back.

Two suns rise over a crime-ridden city known as Lisvalletta. The worst of all is a drug known as “Anthem” that, when taken, transforms the user into a monster. The SEVEN-O Special Crime Investigation Unit is called in to handle these things. SEVEN-O is trying to crack the mystery behind this drug and stop it from getting into the hands of more criminals. However, investigators have to go in pairs. That is when veteran Douglas, someone who is that weird, middle-aged man who loves dad jokes and is probably consistently half drunk, is paired up with newbie Kirill who thinks he has something to prove. True, Kirill has the raw talent, but can it be refined into an actually employable skill?