Making-of:
YouTube: 【LIVE2D RIGGING】LIIIIIIIVE, otomo... LIIIIIIIVE!!!
Which at this moment has been privated for some reason...

Edit:

And it looks like it won't be coming back.

Hi Otomos! Since a lot of people have asked about it! Sorry I had to private the Live2D vod and won't be able to put it back, but I'll rig again soon so hope that'll make up for it!! c:

https://www.youtube.com/channel/UCvN5h1ShZtc7nly3pezRayg/community?lb=Ugkxvx8qOcX2r1iVWmmV7QqGT82IyZFuz624

Some discussion over here mentions that there were some filenames visible at some moments in the stream that should be edited out.
Removing making-of available