Edelweiss, a diviner, breaks a sacred rule by striking a bargain with Lucifrid, a spider spirit from beyond the mortal realm, in a desperate bid to rescue her closest companion. As the unlikely pair works to seize dominion over the shadow forces lurking within their school, they catch the eye of Ilya, an exorcist bent on destroying the apparition and freeing Edelweiss from her supernatural obligation. Caught between conflicting desires—autonomy or submission, attachment or release—Edelweiss must navigate an increasingly complicated arrangement where every path forward demands its own price.