I respectfully disagree with the other reviewer that said that "Rika" is better than titles like Onechanbara" (2008),"Junk" (2000),"Bio Zombie" (1998),"Stacy" (2001),"Wild Zero" (2000) and "Sars Wars" (2004)...they are all different,and for the most part,far more better than Rika.
"Sars Wars" is Thai,and not Japanese,so really different in style (and BTW a great movie!);
"Bio Zombie" is Chinese,different here too (it's for the most part humorous);
And "Onechanbara","Stacy","Junk" are really better than Rika because of the fighting scenes...Rika fighting sux.
"Rika" is not a bad movie,some moments are nice,the story is not bad (except the awful ending) and it's funny sometimes, BUT the fighting are under the level of decency...really bad! And in a movie like this (action/gore) the fighting are really important! I suggest to watch all the titles i said on the top,plus "Zombie Self Defense Force" (a great one).
I agree with the other reviewer only for "The Girls Rebel Force of Competitive Swimmers" (2007),this one is REALLY worse than "Rika"...it's totally crap.
My final rating for Rika 6- out of 10