What is the boundary between “over” and “here”? Everyday where 3,000 people have one “demon”. “Oni” was given the name “congenital cephalopathy” and there was no custom of customs. A high school girl, Saki, who is alive while being aware of the surroundings, her classmate Yuiko, who is concerned about Saki, cello player that drags the past of `` genius boy with protrusion '', Mao, formerly `` demon '' Okutomi who cuts out the horns, the homeroom teacher of Saki who hates "demons" --- 5 stories of human weakness and strength that the existence of "demons" is highlighted.