A 14 year old boy called Suzuki Iruma was abandoned by his parents and adopted by a kindly Demon school headmaster called Sullivan as his new grandson. He is now attending a school in the demon world where his new “demon” grandfather works as the principal. Life at the new school is exciting for the new pupil – if others find he is a human, he could be eaten. This is the great story of life as a human boy attending a School for Demons with his demon friends.
Ritsuka Fujimaru and Mash Kyrielight are given the job to save humanity from demons and monsters that are part of the final singularity in ancient Babylonia (in 2655 BC). When they arrive, they learn that three gods have threatened the main city of Uruk ruled by King Gilgamesh.