This is a special for the "D4DJ: First Mix" anime currently airing promoting the live concert that is going to happen on Sunday this week. https://d4dj-pj.com/news/20201127/post-473 This special might only be available on Youtube for a limited time, if I understood the description directly. So use this chance and grab it now!  More information: [AniDB](https://anidb.net/anime/14815) * [Youtube](https://www.youtube.com/watch?v=rRfTkycp5kA)