This is your average classic beach OVA episode, where you know, characters are in bikinis, they are on the beach, and they usually have fun together. Admit it. We all have seen this before.
But if you watched the whole season, don't miss this OVA, beause it had some original elements, and in this episode especially the sound and animation excelled the original season.
I will try to not spoil the episode, but get ready to get surprised because if Jashin-chan goes to the beach, everything can happen (trust me, you'll know what I'm talking about).
So in conclusion, it was a good OVA, but the plot is too average and overused, however they tried hard to fix that.
I guess the studio really wanted to show it's characters in bikinis, to make the kawaii factor a bit over-the-top.