On a feverish dark night, a black wind swooped down under the pale glow of the dark as Ye Lan, a high school student, gained unimaginable and mysterious powers. Was it a strangely beautiful demon Lolita, an arrogant elder sister, or an innocent, adorable and beautiful sword deity that appeared before him? Ye Lan couldn't find it in him to cross her, and neither could he avoid her. Join him as he's forced into embarking on a mysterious adventure with her into the dangerous unknown together.