Responses
Probably a translation error...or maybe the manga-ka didn't know what to put there and best-guessed it. Bell is absolutely NOT a Hero (just look at her stats and stat growth). In comparison to a level 6 Hero (who hasn't been introduced yet), level 15 Bell's MP was 56 and the Hero was 300+. And it takes her ages to level up.
Thank you! I was really confused about it so it helps a lot to know that it was a translation error
Why does it state that she is a hero at page 25? Was that just a translation error or is she really also a hero? I think in Chapter 1 her job was adventurer... does someone know?