ブルーアーカイブ5周年を記念した、総勢54名の先生による音MAD合作です

This is an 音MAD collaboration by a total of 54 senseis to commemorate the 5th anniversary of Blue Archive.via video description

Original collab video: https://www.youtube.com/watch?v=AAweZqh4_hg
Credit can be seen in towards the end of the video