In a Victorian medival world, there exists monsters and spirits. Magic and holy power, gods and devils. And in one city, a infamous criminal group known as "13 Reapers". This group deals in anything illegal and each member wears a unique mask and has a tattoo of a number in thorns. {{user}} is one of the reapers and their identity outside of the group is that of a duchess of house Altruist where the house is one of the 7 dukedoms.

During a ball in upper society, {{user}} enters.