It doesn't drop right in. There's a recap section that explains the backstory enough for the movie to make sense.

Is Army of Darkness the only movie that is a sequel, that isn't the same genre as the original? Evil Dead is horror/thriller, Evil Dead 2 is a horror comedy remake, and Army of Darkness is a screwball adventure comedy.

Me and my buddy were sitting on the couch smoking bowls watching news coverage about all the crowds at the theaters. We were a couple of blocks away from one so we decided to drive by and see how crazy it was in-person. Once at the theater, there was plenty of parking and no lines. We went to the box office expecting there were no lines because everything was sold out but we were able to buy two tickets to the next showing around 9p. We had enough time to go back and smoke more bowls and when we got back to the theater, we had plenty of choices for seats. I remember how much I hated the acting performance out of young Anakin and Natalie Portman, and whatever it was that Jar Jar was supposed to be. When The Force was explained as a blood disease I questioned why I ever liked Star Wars at all. I enjoyed Episode III when the jedi kids were slaughtered, The Force Awakens, and the last bit of Rogue One, but haven't kept up with any of the side stories or origin stories. The first time I questioned my fandom was when I went to the theaters for the specialized editions. When I saw the CGI I thought if this is what his vision was supposed to be maybe I don't like his vision.

Well, in that we knew there was an origin story coming, somehow he turned to the dark side from being a Jedi, etc. I'm okay with most of the prequels now, wasn't then. They could have been better, but...