Vivian Roman, a young lady who's wish was to major in law gets snatched away by the fate that awaits her. In this world, creatures, humans and non-humans alike coexist.
There is however, an invisible barrier that separates them. That barrier is called "finis". The sky resided by the angels, the land conquered by humans whereas the ocean inhabited by demons. Those who dare cross the borders face hefty consequences. Who dares disrupt the peace between the three domains? Unfortunately that would be the humans and the demons. Centuries of forming forbiden pacts and alliances for the sake of power led to one destructive result, war.
Until this day, the ones who formed those immoral pacts shoulder the burden of their actions. The punishment for the humans were to serve under the angels for many generations to come. To slay the same abhorrent demons whom they've sworn to work with. Whereas the punishment for the hellbound demons.. were subjective.
That meant Vivian, a girl who's done nothing near to that, had to serve under the angels as a knight all because of her greedy ancestors.