Adopt a Demon

This is a short one-shot RPG campaign where the players take on the characters of demons, each a different type, such as a succubus, a creepy child, and a fog cloud. Each demon takes on one of the seven deadly sins which will give them certain advantages or disadvantages.

In this world, demons are kind of like pets and can be adopted into a family. Whatever family adopts your players will expect different things from the party, and they will have some kind of problem that is threatening them. If the family doesn't prevail, the demons will have to be returned to the shelter. So now you have to take matters into your own hands!

And if they're lucky, they might be able to steal away some souls.