The series teased it already with them visiting the power spots and Yui accidentally making a recording of a ghost, but it seems the series actually chose to breach the supernatural threshold.  I think I'm done at this point, there is nothing the manga can do to justify continuing reading it. It doesn't seem as if Janice is a con-artist like someone suggested either,
	
	
		
			
	
 so I can only hope it can still be explained with hypnosis/ suggestion, but I doubt it.
			
			since in the next chapter it seems as if the ghost is possessing Junichi,
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		