Three girls screw around at school.
Oh my god this is hilarious. The execution is waaaay better than Grand Blue, although the underlying material is perhaps not quite as good, I would claim. Just look at the swimming pool short, where the main joke is that the one girl has big boobs. Normally I would be rolling my eyes. But holy shit that was hilarious. Mainly due to the fabulous execution and especially the ridiculous reactions faces.
Easily the best episode of the season so far.