If you're looking for just chapter 28, it's here.
I had to upload the volume 4 batch in two parts because it went a little over Mediafire's filesize limit. Also, I've replaced volumes 1 to 3 with new versions; several pages were re-edited to conform to the standards I've adopted while working on volume 4. But I've made no changes to the translation (other than changing "Silene Mode" to "Sirene Mode", which I decided makes more sense, and also seems to be the official spelling), so if you already have the old versions, there's really no need to replace them, unless you're about as OCD as I am.
This series is followed by Mazinger Angels Z, which I will do next.