So...I've been looking for the Midori vinyl EPs for a very long time and recently I came upon an old and outdated site listing them for sale. I e-mailed the owner not expecting a reply, but it turns out they are still in business and got the records to me quite nicely! I believe these are the people who helped press the record in the first place, and they still have some copies left if anyone here is interested:
http://tokyomusicstore.com/
They have a strange mixed bag of stuff for sale, but the guy was fluent in English and corresponded nicely so it's legit. And of course, who wouldn't want to have Midori-era Mariko Goto on a nicely sized vinyl jacket?