Mobile Suit Gundam: The Witch from Mercury S1E1: "The Witch and the Bride"
I'm not fond of the shonen-adjacent magic high school, at least in its most common form with its usual associated tropes. That would make this story a hard sell for me, regardless of where I found it.
Coming after a prologue that hews much closer to both what I'd expect from a new Gundam series and what I'd WANT from a new Gundam series, makes it a jarringly unpleasant surprise instead of just a hard sell.
Mobile Suit Gundam: the Witch from Mercury S1E0: "Prologue"
This series really, really, really wants to be the 21st century's own UC. Does it succeed at this? I don't know.