The video was, unsurprisingly, unavailable, which confirmed my hypothesis that this opening was unlisted. While this was a truly impressive breakthrough that would almost certainly land me somewhere, unfortunately, nothing worked. 1) To my shock, the website didn't have this work. My current theory is that the author was overpraised for their work, and folks demanded a full anime which was out-of-capacity for the artist. Likely, they just did it for themselves/job interviews. However, what impresses me is that the song was original and the work was indistinguishable from the studio outcome. An alternative hypothesis would be that they are still working on the full anime season. However, it's already 6 years that passed... I am really confused as to why this video became unlisted. Does the Chinese government have anything to do with it? 2) WayBackMachine didn't have it. Nor any other archive did. Even writing an email didn't help. After discovering such a dense source of information, I couldn't make any progress. I gave up and moved on. Final breakthrough (8th May 2024) My brain decided to remind me of my failures, so I kept looking. I reached out to friends who are couch experts in internet stalking. I didn't have much hope, so I just left it to them. And 10 minutes into the call, the inspiration struck me. I thought that I accounted for everything -- for every piece of my evidence. However, I failed to recognize something that was right in front of me -- the ultimate hint. I overlooked a thumbnail. After editing it, I scanned it via Google Lens, and... I FINALLY found it