Sera (an overweight male) constantly loses his clothes

A girl tries to seduce Sakamoto but fails

Some of the delinquents cuss a lot

One of the characters has a name that sounds like it has the F word in it if you don't know how to pronounce Japanese

It's not really cussing but some people might find the fact that Sakamoto resembles what Americans think of the stereotypical Asian

Delinquents are shown smoking behind the school