Unfortunately this isn't as simple as I'd like it to be (believe me, we've asked). The most likely way that we'll get chapter 1 is when Kamishiro Ryu puts out a tankÅbon with the Brand story in it.
Yeah, if they could get it, I expect that they'd have it by now. Regardless, I _really_ hope that they release the tankobon for this. It's too fantastic not to.