 If you liked
Kimi ni Todoke
|
 ...then you might like
Haikyuu!!
|
This one will probably seem very out of place since it is a completely different genre, but I wanted to recommend this one for two reasons.
1. They are both by "Production IG" (which has a ton of solid works that also include Attack on Titan, but I think that would be a bad recommendation for this one)
2. They are both very pure. The main characters have personalities that make it very hard for you to hate them.