Being a Yuri fan forogn enough that you remember breadcrumbing (green green)
- long enough
By breadcrumbing I mean, back in the 90s and early 2ks there were not that many pure Yuri series ( marimite, Utena, kanaduki were stand outs). So we had to do with regular non Yuri anime throwing us a bone and having a random Yuri couple. While that practice still persists ( psycho pass) back then some of these were considered flagship Yuri titles ( my hime, sailor moon, shion no ouz yoake (lol)).
This one is green green an ecchi anime/vn. It was your typical ero galge that had a few thngs to stand out. The plot was less romantic and more like one of the old teenage comedy movies ( porkys, revenge of the nerds Americans pie), and there was a time traveler between the characters.
That being said, as far as Yuri is concerned , it has a Yuri couple, the little sister characters were into each other, instead of being into the main character ( or the side characters who had a crush on them). Even the ending video, ao zora, had them as a couple. Let alone the ecchi specials.