Its tricky to write a review for this one because it is not really an usual movie but it's an anime arc and a very serious and the detailed one indeed. As a movie, it was beautiful I would say. Throughout the movie, you would feel various emotions. Some scenes are cute and wholesome, some are sad, filled with regrets, there is a bit of comic relief as well. You may find yourself having a good laugh initially but the ending is sad and emotional.
Now, coming back to reviewing it as an arc, this is how it overall went :
Story : Beautifully executed. Even though, Enmu was dealt sooner than we expected, the writing is totally justified. We didn't really get to see how Inosuke managed to wake up and break free of that dream but apart from that it was all no-nonsense stuff. There was a thrill but no unnecessary stretching or no unnecessary badasseries. There are few comic relief and cute moments as well. Also, there are quite few classy quotes and I can't get enough of them.
Characters : We cannot say that both the villains were purposeless. They are demons and are brilliantly written. By the end of the movie, their respective mindsets were described pretty well. Rengoku too is brilliantly written but I felt we deserved to know more about his father or Rengoku's viewpoint about his father. I am not really sure if we get to know more about him in the upcoming arc. Regardless, Rengoku seemed closer to his mother. Tanjirou as usual a very wholesome character and keeps giving you various feels. But overall, the show belonged to Inosuke. If you guys were waiting for his character development, this is that moment. The movie doesn't offer much to Zenitsu and Nezuko fans but despite that, they do have their respective moments. And rest assured, you will definitely get to hear "Kaminari no kokyu, ichi no kata. Hekireki Issen!!!"
Art : Outstanding animation. Combined with sound effects, it almost feels like a never-seen-before stuff.
Sound : I am yet to browse the titles but one thing is for sure, each of those OSTs are absolute fire. We could not have asked for better. Rengoku fans should not miss the end credits.
Overall, I enjoyed every bit of this movie.