Issue · Akita Shoten Kanojo no Kagi wo Akeru Hōhō (2008) #2: Vol. 2 Released May 2, 2011 WriterYumi Nakata ArtistYumi Nakata Next in Kanojo no Kagi wo Akeru Hōhō (2008) #3 · Vol. 3 Feb 5, 2012 #4 · Vol. 4 Oct 5, 2012 #5 · Vol. 5 May 13, 2013 #6 · Vol. 6 Feb 5, 2014
