In All Demons Go to Heaven, Samwell is an orphan who has never known anyone but his nanny, Charlotte, who has been relentless in her bullying of the lonely young man. Grynesha, on the other hand, is a succubus who left the Demon World for the Human World for one reason: to get back what was taken from her. Grynesha will give Samwell the life he deserves, one full of lust and power, but in exchange, she will use him for her own gain. As a result, Samwell will find himself in a variety of compromising situations with the women he meets on his voyage, all thanks to Grynesha's talent to concoct such scenarios.