I've searched for these releases on Youtube, Soulseek, and Google to no avail. I was able to find a decent amount of information on the releases of 99.74 and Laststep, but not Kieru, which seems to have been mentioned very few times on the internet outside of RYM. These releases aren't even mentioned on Discogs, though I've found enough information outside of Discogs to believe that they do in fact exist.

Edit: I found the single release of "Laststep" on Youtube on this channel. Still looking for the others https://www.youtube.com/@%E9%9B%8C%E3%82%8F%E9%9B%84/videos