This episode is certainly a fun little side quest. It's only cool because I watched it right when it came out and there were no other Kaiju No. 8 episodes out. I can understand people not liking it, but I'm not one to skip episodes, filler or not. I liked it, but I suppose it's not necessary to the plot of the second season. So, I will say that this episode is good, but it's not necessary. However, if you're a real fan of the show, why would you skip it? It's right there, easy to access for you on Crunchyroll, and so you should justwatch it.