This is an ONA from the original series Monster Musume, it is "60 episodes" that are 34 sec each.
-spoiler alert (I think)
-please tell me how I can improve my reviews
So basically, this whole ONA is just mini shorts of all the different characters doing stuff like cooking, taking a bath or sleeping thinking of our darling-kun, with some cute moments and some lewds moments.
I think that these episodes aren't bad but they are kinda boring. We kind of know what is going to happen because we've already seen it in the anime like Miia bad cooking etc.. It's pretty much a waste of time in my opinion and there's no particular character development, so it's not mandatory to watch it.
So in conclusion, this ONA is pretty much useless, and kind of a waste of time but if you are a fan of the series, you can watch it but you'll get bored after a couple of episodes.