Aria the Animation, Urara Meirochou Recommendations
Same group of friends who work for a particular job with a mentor who will help them.
Cute as hell for sure.
In both series there is a group of beautiful girls about 15 years of age who are apprentices for some profession - in Aria it is undine (gondola tour guide) and in Urara Meirochou it is fortune-teller. All of the girls are also aiming to be the best in their given professions although their daily adventures are the main focus in both of these anime. In each anime there is also an onee-san character who is a bit older than they are and from whom they are learning (in Aria there are another 2 of those).
Urara Meirochou is much more moe and comedy oriented while