 If you liked
Ao no Flag
|
 ...then you might like
Haisha-san, Atattemasu!
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Both manga are from Shounen Jump, and both explore the hidden feelings a man has for another man, without poking fun at their feelings, their relationships, or their sexualities. The genres are vastly different - Blue Flag is more serious, while Dentist-san is pure comedy. Even so, I'm sure that if you enjoyed reading one, you'll love reading the other.