This movie seems like a movie vehicle for an idol group. There are lots of good songs. There is an extended dance sequence in the end for apparently no reason.
The idols do not try act. They act natural. This makes the movie easily watchable with subtitles. There are lots of laughs. The dead girl getting split in half was extremely funny. The deadpan reaction of the main idol to the dead girl is worthy of an oscar.
There are some action involving automatic weapons but the girls seem to handle them like toys.
There is no nudity so kids can watch the movie. There is some gore but that is expected in a horror movie. The dead girl's clones splits the villain in five pieces. You should see the movie just for that.