I've tried for a few hours but wasn't able to get the raws for free. If someone gets me them (dm me a .rar or something) I'll translate + edit + post them.
From what I can understand you can get it with a free trial from "video.unext.jp/lp/book?". At least, they list all volumes (4 total), and they give you enough free credits to purchase them. Only problem is, I don't have a phone number the site's accepting.