Not exactly but it reminds me of this..
http://www.mangago.zone/read-manga/love_lesson/
yes this is it! thx <3
lol I messed up the description a bit
HA+ (≧∀≦) Don't worry. If it's the one, then just enjoy reading.
Hahahha i messed up too. I put an answer to the wrong question. How stupid of me. there was another person asking for this manga. Hhahaha
Hope that person is not still waiting. HA+ (≧∀≦)
I was confused
the manga starts with the mc getting molested in a bus on his way to school by a guy who goes to the same school. The mc is a new student in this school, and he's not used to being groped in buses. So he feels flustered and goes to the rooftop of the school to smoke but the guy who groped him earlier comes and tales the cigars from him saying that those are not allowed, so the mc goes like (mentally) "its your fault to begin with!!!" . Then the groper asks him to come later to take back his cigars and walks away from the roof. Can't remember anymore