I was blown away by Demon Slayer: Mugen Train because of the beautiful and consistent animation all throughout. There was no bad panel, not even one. The use 3D in combination with 2D animation was seamlessly crafted. The fight scenes never missed a beat. The use of perfect background music to accompany each scene made me ugly cry 25 percent of the movie and kept me suspended in suspense the remainder of the time.
I was blown away by the quality of animation and detail they put into this series. Every frame and every background was expertly crafted and remained true to the original manga artwork. The vibrant colors and layers made the scenes even more intense.