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.