Yeah, I know. That's what makes it funny to me lol. NTR is worse than death to people, so the thought of someone getting tricked by a manga by this creator is hilarious. Reading 30 chapters of updates before it kicks in officially too, jesus
Found it by pure chance as an auto rec for another manga I checked on MAL. I had (kinda) gotten the date wrong, it started in 97 and ended in 2016. Sadly was never fully translated like I'd hoped...
https://mangadex.org/title/cbac35df-ad82-47aa-a2a4-b55a9eee1efb/iketeru-futari
That is a good guess actually, but unfortunately not it. Pretty sure they were both in high school, and the art style seemed more "shounen-esque".
All I remember is her and maybe that the protagonist kind of seemed desperate or like a player.
The heroine had short, blue hair and looked kind of like Rei Ayanami. Can't remember the name for the like of me and I'm 50/50 on if it had an anime of not. It had a classic style to that Era, not realistic. Looked pretty shounen.