Well, first time I've tried to translate anything on danbooru. Fairly sure I've got the first panel right, but the first kanji on the 3rd panel has me stumped as to what it is, so I'm a bit stuck for now.
Are you talking about the left or right speech bubble in that panel? I'm pretty sure the word in the left one is 高校 (high school, so presumably where she played basketball previously), and the one in the right is 幻想郷 (which is, of course, Gensoukyou).
Could somebody translate the other pages? It seems really a interesting doujin.
I was part of the basketball club up until high schoolThis must have gotten here because it's an outdated type of ball.I've got it!! In that case, I'll just have to make it popular with my own hands!Hm?They don't play basketball in Gensoukyou, but I kind of feel like playing again.Episode 1: The Beginning of It AllFrom the Artist's Pixiv page.Today is also a good day, eh?It's a basketball...Really brings back some memories.