Animation file from FGO arcade, uses the same engine as various Project DIVA titles but the animation files are formatted in a different way.
.mot Tool: https://github.com/h-kidd/noesis-project-diva (works with FGO Arcade's model files and .mot files from Miracle Girls Festival and Project DIVA but it doesn't work with FGO Arcade's .mot files, but you can edit the source code of the tool to try to make it work with the game's .mot files)
Sample file is in the attachment.
mot_svt_0001.zip