Japanese filmmakers have always impressed me. Akira Kurosawa and Takashi Miike are two of my favorites for different reasons. The one thing they gave in common in a masterful command of the mechanics of filmmaking. This can also be said of Ueda's funny and well constructed One Cut of the Dead.
Unless you're paying attention you will miss the opening sequence that is a staggering long take. It's great as it's the culmination of the latter part of the film. If I describe it to you, it might go over your head so the less you know, the better. There is a big movie-within-a-movie concept that pays off by the end as you see just how much work went into the construction of this film. It's a horror movie. It's a comedy. It's a documentary, sort of.
If you aren't the type to enjoy seeing the strings of a movie being pulled in front of you, this might pass you by. However, any film nerd worth their salt will enjoy the hell out of this and laugh like I did.