So, nobody wants to step up and guess which one is the office lady and which one the college student? The header says Age gap
but they don't appear very different in that regard to me. (The issue isn't helped by the roles seeming to be reversed--glasses-san on top--on the title page.)
If forced to it, I'd say the short-haired one is the college student, but only because the sleeveless top doesn't seem like office wear. But I could see arguments for the other way around, too. Am I missing a clue here?