In a certain world, to deal with civil disputes, a lawyer must first learn how to create traps and avoid fraud in a contract so that they can reap more benefits for their employers.
The Devils of this world are masters of deception and experts in contract frauds. However, if there isn't a single ounce of truth in their words, their reputations will sour sooner or later and no one would be foolish enough then to sign a contract with them.
Thus, using the souls of both parties as a guarantee, as long as one is able to detect all of the possible traps in it, the Devil's Contract is instead, the world's fairest and most effective contract. This is also the reason why it is popular in many different dimensions.
