Reki Asubino bears a cursed mark that shuns away his peers and family, leaving him seemingly isolated in the eerie Devil's Mansion. Despite the eerie silence, he is surrounded by a peculiar array of non-human servants. While showered with gifts, what Reki truly yearns for is human companionship. His wish seemingly comes true when he receives an unexpected package containing not just a human companion but a nurturing mentor and a close friend. Yet, as Reki delves deeper into this newfound bond, uncertainties linger about the true nature of his companions.