On-line chapter here: http://online.ichijinsha.co.jp/books/zerosum/wa/wa_001/_SWF_Window.html
only minor charges and improvements in some picture, the story is the same.
From her blog we know that after the next ibun chapter will be relase the first ibun volume too!! :3
(MY BRAIN COMPRESSES AND THEREFORE FLATTENS INTO NOTHING. U HAVE WON THIS ONE, MINEKURA)