Based on the manga series by:
Ergastulum was once a safe haven for "Twilights," super-human beings born as the result of a special drug but are now being hunted down by a fierce underground organization. This new threat is rising up to challenge everything the city stands for, and the Handymen will not be able to avoid this coming war.
The setting in fictional city, Ergastulum, seems like a relatively decent place, where Twilights (special human beings with advanced physical capabilities due to a drug called Celebrer) and criminals can live but is actually: semi-controlled by the country’s government (Like “Where the hell are you guys?”), but actually run by local mafia/guilds, and ongoing Anti-Twilight factions continue to threaten the lives of the Twilights therefore causing endless bloodshed. In a place where you live life without regrets, our main trio must continuously move forward with their lives while carrying or shoving away the weight of their pasts in hallucinations and nightmares. The disconnection to reality is prominent. Not only because Gangsta is set in a fictional city but because there barely seems to be any laws outside of Three Principles that govern Twilights, almost all of the reoccurring characters have some type of super capability, and everything in or around Ergastulum accepts violence as an answer.
The characters of Gangsta are hard to forget as Nicholas is a deaf Twilight that doesn’t particularly care about consequences and lives his life, Worick is incredibly easy-going and relatable to an extent, and Alex shows us how vulnerable we as normal people can be. Each of their backstories is explored just enough to have the viewer filled with sympathy. In it’s visual aspects, while the animation was nice it started to decline near the last episode due to the studio’s bankruptcy. Overall, I would say Gangsta was addicting throughout but with a very anti-climactic, cliffhanger of an ending. If the anime were to continue with a second it could explode with popularity.