But... Lesbians Exist might have been groundbreaking in 1997*, but it's not groundbreaking now.
That doesn't mean it's not good; it is. Just don't expect it to be like nothing you've ever seen before.
* I'm not sure it was then either.
Oh, and the YouTube upload is legitimate and from the real licensor.
https://www.youtube.com/playlist?list=PLrrh84y760v-hDEulas0Tp_wiQy0FcjLl
Speaking of long, this is a slow burn.
There's a fairy tale rule of three thing going on where in the first arc Utena fights a duelist, then fights their other half in the black rose arc, then fights the pair in the endgame arc.
And the setup is nice.