just wanted to mention that after having finished the manga & started the OVA, even though the tags aren't on mal, i strongly consider this an action-oriented series. i don't think there was a single chapter that went by without someone getting punched or kicked, and most of the plot revolves around how mitsuhashi and itou best their enemies in fights. the entire series revolves around fighting and delinquency, as well as jokes. yet the two do not have an action tag for some reason. i'll include a few screenshots so you can get my point:
as you can see not only is it throughout the entire manga but involves the entire cast, from the main characters to side characters to enemies.
as for the anime,
it's a bit harder to see since a lot of the fights are censored and do just punch animations, but it's definitely there. here's an example from ep 1 that they censored through a train passing by and covering most of the punches:
more examples from episode 1:
and those are just a few examples of many, many more. would really love to see an action tag on this series.
edit: found the ed which has a bunch of the scenes sped up and thrown in there, you should be able to get more of an idea as to what i'm getting at