Terra Aetheria is a place where light is dominant. Angels have descended from the heavens and have started ruling over mankind. Since they have come down, humanity has flourished. Diseases are easily cured and death can be prevented. On first glance, this seems like the perfect utopia. But is it really? Angels demand the lives of demons in order to grant people with divine energy. Are demons actually as they depict them – wicked, bloodthirsty beings? The story follows a determined and hardworking young human and his family, a mysterious but noble demon, an adventurous angel with a pure heart and a witty and playful woodland nymph. Is it justified for humanity and angelic beings to flourish at the cost of demon blood? Fate has brought this seemingly bizarre group together, so that they can find out the true intentions behind the unlimited generosity of the angel aristocracy.