In a modern city but a place where monsters appear, Demien joins JSH, a monster hunting service. He has a fearless free spirit and can live anywhere. One day a monster attacked the city, A girl in a school uniform is focusing on reading named Jina, Jina is actually a hunter just like Demien but is not open about it, Demien came dramatically holding a gun while riding a motorbike and performing acrobatics with his motorbike.