Interesting, they mixed (or rather, extracted) events from both volume 3 and 4 and combined them into one episode. And surprisingly, it worked quite well.
The next episode is going to be the second part of the love potion story / Tabitha+Kirche's mission. With this, the anime pretty much covered vol.4 except it's main plot (which is alright, since it wouldn't make sense without finishing vol.2 and 3 first anyway).
Hopefully, they'll do the love potion story right. In the next episode, I look forward to seeing,
I'm counting on you, J.C.Staff.