Boy show a girl an adult magazine with half nude cover
There are some references.
A main plot point reveals that a character was at a love hotel. Is abrupt and barely noticed by some. No scenes are shown regarding this. Also, this point is very quick.
A Girl Is hurt by a Boy whom Tries to embrace her. Nothing happens As she runs away.
A boy unzips and pulls down another boys pant's while being held down. This is done as a way to bully the boy, it is not meant to be sexual. It can be a sensitive scene as the movie revolves around bullying and suicide.