 If you liked
Sasaki to Miyano
|
 ...then you might like
Hirano to Kagiura
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If you didn't know, ther's a spin-off of Sasamiya called Hirano to Kagiura.
Both are by the same mangaka so the story and characters are written in a similar kind of sense. (Many characters appear in both series'!)
I really recommend reading Hirano to Kagiura if you can't get enough of Sasamiya, or if you just like really sweet, fluffy high-school romances that have a cozy feel.