Battle Royal High School
I should've kept waiting.
The most immediate (if mildest) problem is the pedestrian animation. Battle Royal High School looks rather sketchy, as if made in a rush or on a small budget; the impression of careless haste is worsened by continuity errors along the lines of the Hulk's self-repairing shirt. I'm not opposed to primitive animation; heck, I'm a South Park fan. But in South Park I can tell the characters apart. In Battle Royal High School, four different men look alike (one varies mildly from the template by being long-haired and pointy-chinned). Two of these four fellows actually are the same person, from different dimensions. When the other two important males showed up, I thought they must also be the same person as the first/second guy(s), but I didn't know. Uh-oh.
As this confusion suggests, the plot has some clarity problems. The hero, Hyoudo Riki, appears first in a realistic tiger mask that initially made me think he was a tiger-man. The over-large cast is bewildering, but that's probably because the anime is adapted from a lengthy manga titled Shinmajinden (Legend of the True Devils). Additionally, the plot changes genres almost as often as a chameleon changes colors. At first, the anime seems to be about a high-school love triangle; then it appears to be fantasy (that tiger mask); then it turns into a non-magical martial-arts movie; then it changes scenes to a horror-movie "Dark Realm"; then a spaceship suddenly appears. It's possible to blend romance, martial arts, fantasy, horror, and science fiction in the same movie, but the key word is "blend"; in Battle Royal High School, the genres are a series of jarring changes.
The biggest problem with the plot may be that it just isn't compelling; it's little more than a flimsy excuse to string together fight scenes. As a result, the climactic battles nearly put me to sleep. And I like fight scenes.
Riki's otherworldly double is no mere high-schooler; he is Byoudo, Master of the Dark Realm. Byoudo's transparently treacherous pal, the (female) Fairy Master, has persuaded Byoudo to possess Riki and attempt to conquer this new world. The resulting "hyper-psycho-kinetic-wave" attracts the violent attentions of demon-slayer Toshimitsu Yuuki and space-time cop Zankan, and the fight scenes grow ever more bloody....
If you watch movies for the fight scenes, Battle Royal High School may be your cup of gore. If you prefer the fight scenes to serve the plot, look elsewhere.
DVD Extras: storyboard video stream.