Forest of Piano (2018)

There is a part in the first episode where a bullies force a boy to pull down his pants so they can examine him to see if he is worthy to be part of their group.

In the first episode there is a part where bullies force a boy to pull down his pants and underwear so they can examine him and see if he is worthy to be part of their group. Nothing specific is shown, besides half of a butt-cheek, and one of the bullies is leaning down to evaluate him.

Bullies torment the main character about the fact that he doesn't know who his father is because his mother messes around. A little while after, some of the teachers are having a conversation about the line of work the main characters mother is in, implying that she is a prostitute.