Divine Messengers & Demonic Guardians

What lurks beneath? The land is split between a heavenly realm where angels dwell and a lower realm made of wastelands. A band of angels is chosen to journey to the lower realm as an envoy from heaven, but the lower realm is fraught with danger. Luckily, they have masked demonic bodyguards to protect them. The two sides have a purely transactional relationship until one angel, Dori, curiously peeks under a demon guard's mask to find that demons have the same visage as the angels. Could the demons they have been told not to fraternize with have more in common with them than they thought? What is preventing them from creating relationships in the first place? As their journey commences, they find that the danger of the lower realm may come from a source close to them…