It seems very specific and embarrassing. I like how her classmates are "ask her, she's the LESBIAN!" and she's like "wait, I found about the whole thing by watching YOU TWO making out" and they're all "We had a Pure, Story S, Romantic Two-girl friendship, a practice romance for dating boys and getting married later!" It's like this one anecdote has the whole of yuri from the 70s till now in it. Well, if it was the 70s Tamamusi would die tragically.
The way the last panel was phrased though, it feels like it's saying they're still together...?