(THESE ARE MY OPINIONS)
Spoiler Warning. If you haven't watched it, don't read it!
The Devil Is A Part-Timer is overall a pretty awesome anime but it is not my favourite. This is mainly because it leaves so many questions unanswered, which can sometimes be a good thing but I don't think it was a good idea in this particular series. One of the voice actors in White Fox (the company that made The Devil Is A Part-Timer) said "A second season...we aren't doing one!?" which means that she was wanting to do another season but are not. This means that all of the questions cannot be answered unless White Fox tell them. So no-one knows what happens to Sadao, Emi,Shirō or Lucifer. I wan't to know!
With the little bad things out of the way, this series is very funny. Also it is just so unique by following the story of a not so evil devil working at "mgronalds" to take over the world. Which is an amazing story! All in all the series is a good laugh and good if in need of a short anime to watch!