Kresnik on 04 November 2014
http://www.play-asia.com/hyperdimension-neptunia-rebirth1-paOS-13-49-en-70-7qot.html
Play Asia have Neptunia Rebirth for $28 (£18) for the week.
Can wholeheartedly recommend this game. 35 hours and counting for me, and I'm planning on doing a NG+ run too.