Socially-awkward Maru Han bombs his fifth attempt at getting a dream job in the civil service. But after a strange creature attacks him in the mountains, he finds himself recruited into the Special Civil Service for the Ministry of Environment. This secret organization is dedicated to fighting nachal, human-devouring demons who appear in clouds of yellow dust. As Maru struggles in his new job fighting nachal, he must find out why they're mysteriously drawn to him before the prophesied end of the world arrives.