It's hard for me to rate this film because I liked it and hated it at the same time.
What I liked:
-cinematography was on point, overall everything was aesthetically pleasing.
-acting
What I did not like:
-90% of characters. Specially Murata, who made my blood boil multiple times.
-ending..

This story is based on real events so I'm not surprised about how things went on. I get that this film might not be for everyone, particularly if you consider yourself to be sensitive. Film went slow (didn't have to last 2h 30m) but the way the film is directed made it interesting regardless.
I got kinda annoyed by the attitude of the characters following this cult, I refuse to believe society can be this submissive. Hoping that the director just exaggerated the situation, because I rolled my eyes so much throughout the movie: come on, you can't be this blind & dumb.
[SPOILER ALERT, SKIP TO NEXT PARAGRAPH] I was waiting for those two guys to end up receiving what they deserved but the film ended so suddenly! It left me hanging. They do specify that they ended up in jail/one had a death sentence, so that makes me feel a bit relieved.

Overall, 5/10, nice experience since I haven't watched a lot of gore-ish Japanese cinema, but probably wouldn't watch again.