a manga where a girl meets a ghost that see can only see with her phone or computers. at the end the ghost go to the afterlife where it's revealed she is only in a coma but can't come back to the world of the living because everyone forgot her. but then the girl arrives at the hospital and try to kiss her but she comes back to life with her memory.

This?
https://dynasty-scans.com/chapters/yuurii#1

I'm looking for a one shot that I have read on this site. There was a blond girl and a short hair girl, the blond girl was kind of a player, and she named her ex-girlfriends as Ms A, Ms B, Ms C... At the end of the story, the short hair girl ate something sweet that the blond girl got from her ex-girlfriend despite hating sweet stuff.

I don't remember the football fish fiasco. Which chapter was that?

https://dynasty-scans.com/chapters/a_story_about_doing_xx_to_girls_from_different_species_ch47#8

So Ishidou Natsuo but she has a nice personality