Why the low rating? this was so fun to watch!
When I finished the first season I thought "oh no, they never got to actually learn how to rescue civilians because these villains showed up!" and this OVA delivers that. It's funny, it's light, but then a new villain shows up and the kids are like "oh NOT THIS SHIT AGAIN!!"
The fight scene is intense, the way we're used to, and even if you know what's coming, it will amaze you.
I wasn't expecting the ending and to be honest that reveal just made everything even sweeter.
I recommend every Boku no Hero fan to watch this, it's definitely worth it ;)