I would be all over this, but I fucking hate Double Jump guides. I purchased the Disgaea one on clearance around a year ago and was thrilled until the pages started falling out the first day I used it. Seriously, pages just come loose and fall out. And I am careful with my books/guides. I will never buy another one.
That's what started to happen to my Persona 3 guide. I didn't use it much after that. My Persona 4 guide is fine though.