It's always interesting to see how Japan takes and adapts Christian folklore into the surreal world of anime. Hell is a concept almost ubiquitous in religions around the world, but nobody seems to be able to agree on it's exact nature. While a strictly Biblical depiction would show it to be a place of only suffering, eastern ideas about the afterlife paint it as being basically a continuation of our society as we have it already here on earth. So of course Hell is going to be a Japanese high school, where they play volleyball and talk about which boys they like.
The philosophies aside, what really stands out in this movie is the unique art style and animation. It's the kind of thing you can really only get from anime, and is hard to describe in just words. Even if the plot is utterly nonsensical it ultimately doesn't matter if it still looks cool, and it does. Honestly that's really all it had going for it for me, though. Looking cool isn't really enough to elevate it's score much past a 6/10, so that's what I gave it. Kind of dumb movie otherwise.
