GM!!
I had a dream Nina came back for Ethyrias anniversery for a cover with the girls and at the end she came on screen and said "Isnt that way better than last time we sang this song?" and pulled up a side by side comparison of part of the old mix and the new one they premiered. I dont know what song it was but the music video had them on the edge of a plane wing dancing and I can only really think of the music video for this song since the lighting is the same and there was building in the background.
https://www.youtube.com/watch?v=VzeF1CwJwSgThe chorus had Nina and Millie as the main vocalist in both the old and the new mix so you could really tell how much she improved over the year(?). In the afterparty Nina had a racecar driver outfit that was tight around her tits like her NotNina model with I think the same mama(I dont rememebr the name) and not So-Bin drawing Nina, Reimu was in her newest outfit but it was more transparent, and Enna and Millie were both in matching blue and green summer jackets with their mascots patched on their shoulder like they had a joind outfits together. Nina said something about already working on next anniversary and Reimu said something like "Its cool that we get to see you once a year. Like visiting your family on christmas" and they laughed really hard. The stream ended and I was on a plan watching it in my seat. I dont remember much after that