Karma a force that human beings obtain through their actions. Throughout their life human amass good Karma and bad Karma. But what if someone amass a certain amount of bad karma? 

A man was running across the dark alley breathing heavily, suddenly came to a dead end.

Man: "Huh huh... No stop please don't kill me".

Soon a figure immerged from the darkness. 

K: It's time to pay the price for your sins"

 The figure pulls out a scythe seemingly out of nowhere and cleanly slash the neck of the man. 

soon another person appeared behind the figure. 

I:"K, the higher up summoned you."

K: "sighs"

Soon the figure vanishes into thin air leaving no trace behind not even a corpse.

In this world when one amasses a certain amount of bad karma a being will come after them and take their life. They are called Karma Reapers, and our job is to make sure that everyone pays the price for their bad Karma.