 If you liked
Aria the Animation
|
 ...then you might like
Kemono no Souja Erin
|
Both series have a calm and soothing atmosphere, at certain moments touching serious and important topics (it should be noted that watch Kemono no Souja Erin is more anxious and it has a more specific storyline).
Also similar music and interesting characters, the main characters study throughout most part of the story.