If I had a nickel for every time a yuribait anime episode centered on an original wind ensemble arrangement of T-SQUARE's 1986 tune "Takarajima", I'd have two nickels. Which isn't a lot, but it's weird that it happened twice.
the anime in question
The two episodes are S02E07 of Hibike! Euphonium (my beloved) and S01E05 of the currently-airing Rock is a Lady's Modesty (which is quite fun so far!)
Thank you—both the video and the making-of were right up my alley. It was so neat seeing everything the creator had to pull together (including ToTK jank) to make it happen!
Also the comments led me to this interview quote from ToTK's director, Hidemaro Fujibayashi: