Heion Sedai no Idaten-tachi
What is Heion Sedai no Idaten-tachi about (plot, summary)
Gods appeared when humanity was on the verge of destruction due to the work of demons. Deities called "Idaten" fought and sealed away the demons 800 years ago. Nowadays, the Idaten have no fighting experience and they live peaceful lives. But now the demons are reviving, and the battle between gods, humans, and demons is about to begin.