 If you liked
Oyasumi Punpun
|
 ...then you might like
Boku to Issho
|
Both are tales of adolescence, in both of this manga main character is somewhat unadapted to his surroundings but at the same time observant which generates a lot of somewhat cynical humor in the story. If you liked Oyasumi Punpun you will certainly like Boku to Issho, as they both are great manga for people who enjoy reading more mature content.