Title: Satan's Bride
Rupia is the only daughter of one of three major noble families in the empire. As the only daughter, Rupia is lovingly doted on by not only her parents but also her brothers. The only downside is that she has yet to debut into society, even in adulthood, simply because her family is overprotective. Unfortunately, though, her family cannot protect her from everything.
One day, the demon oracle Cleora demands that the underworld takes in 500 human women as their brides, starting from the ruler down the long line of succession of the demon throne. When the decree is sent to the royal family, they put out a royal decree to all noble families to give up one of their daughters for this noble task. That, unfortunately, includes Rupia. Her family, of course, detests this command but is unable to fight against it due to their standing in the empire, so Rupia, along with 499 other human women, is transported to the underworld.
Once there, the women are met by demon maids, butlers, and even the demon king himself, Edith. Almost none of the women can communicate with demons except for Rupia and three other women, as they have learned some of the ancient language, which is one of the few languages humans and demons share. As a result, Rupia and those three other women are chosen for the king, and the three demons next in succession for the throne.
By random draw, the women are doled out to their respective partners, and by pure luck, Rupia is chosen by the king of the underworld, Edith. However, Edith is just as displeased with this situation as Rupia. As it turns out, he didn't want the human women at all. Even so, Rupia and Edith have no choice but to be together. As the new queen of the underworld, how will Rupia manage her new life in this strange place, and will she be able to thaw the icy Edith?