I read this oneshot years ago and it randomly popped in my mind and now all I can think about is reading it! I just cant remember the name at all 🙁
Description:
Its a shoujo romance oneshot about a girl, with long black hair i think, sits in the library studying and looks through the window down at a popular guy with blonde hair playing soccer. At the end im pretty sure he comes up to the library and then confesses or something?

using this to find mangas i forgot the names of

Namae Mo shiranai. I read it today itself! https://www.mangaupdates.com/series.html?id=88372