[This tweet from 2010/04/30](https://twitter.com/Simfany/status/13156343971) is the oldest mention of this video I've been able to find. "Sometime before that" is the closest I've been able to narrow down this video's original upload date.
Only Editors can add unavailable uploads currently. I think we're eventually going to create some sort of megathread to facilitate such requests and direct people there when they're made.
original (unavailable)
https://www.nicovideo.jp/watch/sm6287941
data
https://web.archive.org/web/20210228033956/https://www.nicovideo.jp/watch/sm6287941
Did [[PinocchioP]] really contributed themselves to the works tagged with this creator tag, rather than just being an author of the song? It can be [an author song attribute tag](https://otodb.net/song_attribute/%E3%83%94%E3%83%8E%E3%82%AD%E3%82%AA%E3%83%94%E3%83%BC) for the latter case.