The city of Eaden, a gigantic, abandoned factory of unknown purpose, is a place inhabited by criminals and monsters so terrible that the rest of the world rejected them.
But, in a tiny, hidden corner of this city, resides a small circle of people trying to live in peace far from the rest of the world and the other districts of Eaden.
This peace however, seems shattered as a group of friends finds out that one of the strongest, most feared creatures of this world, a siren, is roaming around in the city and they have to find a way to stop her from destroying everything and everyone they care for.