So, I've been searching for a manga that I read a long time ago but can't seem to find it. The story I want to find is a oneshot from a girl who liked a guy and she wanted to be closer to him then suddenly transformed into a boy. The funny thing was that after they confessed and all that jazz and she was able to turn back into a girl, it was then the guy who transformed into a girl. It's a genderbender story but I've looked everywhere and can't seem to find it. I remember it was a manga with a collection of stories and almost sure it was shoujo but can't remember what the other stories were.

Anyone knows what manga it is? I really wish I could read it again. Thanks in advance!