In Sinsations 2: Modern Gods you take the role of returning Deadly Sin of Lust, Kosuke, or the Deadly Sin of Lust, Maverick. You're tasked by Lucifer to help clean up the cities of the world by getting rid of Modern Gods that have started appearing.
Because the world is being influenced by these Modern Gods and Lucifer's Deadly Sins are having less and less influence themselves, Lucifer is commanding all Deadly Sins to get rid of any Modern Gods they come across... By any means necessary.
