Youtube: https://www.youtube.com/watch?v=1upx9iz8I_c (修正版)X: https://twitter.com/YoitsuHifumi Misskey: https://misskey.io/@HifumiYoitsu NicoNico: https://www.nicovideo.jp/user/66965964/series/398695 CC-by: http://creativecommons.org/licenses/by/3.0/
http://www.nicovideo.jp/watch/sm45272393
