They've got a simple CM generator on the Kizuna site (have had for a while, actually, but I suppose I only decided to look at it now). Just played around with it for a bit, really...
http://higu.biz/cmgenerator/usercms/blogparts/8476/s And Sou (the second part of Kizuna) is apparently coming out sometime in November. Unfortunately, Tsumihoboroshi isn't on it ( it's going to be in the third one), but Himatsubushi and Meakashi should be interesting.
Much as Natsumi's alright, I rather hope that the extra arcs with the other ones will at least feature Keiichi and co. in some of them; I wouldn't mind having extra arcs featuring them. (And Onisarashi is one of the more violent/gory chapters of the series, although it isn't really part of the 'main story'. It's useful for L5 understanding, but apart from that I find it a bit too scary. Erm).