Dracu-Riot!

“Aqua Eden” – a man-made floating island where gambling, sex trade, and thievery is allowed by the government. But there is one more thing that lurks in the streets of the island–Vampires. Mutsura Yuuto is working with one of them, and together with a few other members of their group, they fight to uphold morals on the island
(Source: jCafe24)