Well, that's the #CrestOfTheStars recap movie.
It just recaps the plot of the first season (Crest of the Stars), but this is actually a good thing because I watched the show years ago. I remembered some of the major plot moments, but not the whole course of the story.
I do wish there were better subs. Maybe there are but I don't have them on hand. Also the storytelling left out a few details, but so be it. The fact that I remembered them is proof the recap movie did its job.
So far this year I've watched 9 cours, 3 shorter works (a catch-all category for specials, OVAs, extras, etc.), and now 1 movie.