For an episode primer, they did a fantastic job with the Maou’s back story and the transition from serious action to comedy was really good. I was expecting this series to be fanservicey right off the bat but it turned out to be decent. And I found myself laughing in that made-up demon language or whatever. Seiyuu adlib perhaps?
Speaking of which, it looks like Ohsaka Ryota is getting more roles recently. From OniAi to OreShura to this. Expecting great things from this one.