It's about a girl with long dark hair, she's really popular with boys. She stalks a girl with short dark hair and takes photos of her in secret. She have a guy friend too. He sales his photos about her crush with the girl.
One day, she going tutoring the girl and after the exams, this girl learns that the MC failed.
These two talk on the rooftop and it's the end.

Wow, I have no idea what this one is.

I know it but, I can't remember the title or artist, I'm sorry ;<

Sounds like early Yuri Hime or previous, though.

http://dynasty-scans.com/series/rhapsody
Our Relationship

^Yes this one. Thank you flips.

Aaagghhh, that's exactly what I thought it was! Flips delivers!

No problemo~~