There's also an appearance by Junno and Ueda - one vid, each - but no Nakamaru, Kame or Jin since this post was focused on Koki.
The videos are mainly cut from old Music Jumps (which I think is the predecessor of Shounen Club), and one file from I Love B.I.G..
There are descriptions for each download, along with several screencaps. Those screencaps are, once again, Koki-focused.
If you're interested, please follow the link~♥