I watched this movie in my year 11 (tenth grade) Japanese class, and we found it absolutely fantastic. Of course, like many "sillier" comedies it made absolutely no sense in some parts (e.g. The swimming teacher: "It turns out I'm eight months pregnant! I thought I was just gaining weight!" I'm glad there is no dubbed version as that would have killed it completely. It is very crazy and much of the comedy comes from sheer silliness or slapstick- acting not so good but this is more or less disregarded and often adds to the comedy.
If you're looking for Friday night fun with boys with killer Dance Dance Revolution moves and a run like Napoleon Dynamite, this is your movie.
If you're looking for Friday night fun with boys with killer Dance Dance Revolution moves and a run like Napoleon Dynamite, this is your movie.