 If you liked
Yokohama Kaidashi Kikou
|
 ...then you might like
Marie no Kanaderu Ongaku
|
Both YKK and Marie no Kanaderu Ongaku is about the decay of humanity and how to deal with it, set in a post-apocalyptic world. Both contain fantastic art, but most of all, they are extremely emotionally touching. Marie no Kanaderu Ongaku is much shorter, it can be a good start.