The protagonist, Xiao B, is a graduate student who, after reaching the end of her study period, still cannot graduate. Upon learning that graduation might not be possible, Xiao B returns to her rental apartment and discovers that the adjacent unit, which has been vacant for a year, suddenly has a flicker of candlelight and faint sounds resembling incantations. Over the next five days, as Xiao B speculates about the activities in the neighboring room, her mental state gradually begins to unravel within her own space...