The cockroaches replace humans while the humans replace gods?
That's one way to interpret it no?
A commune of cockroaches live and play in a dude's apartment in modern day (well late 80's) Japan. Nobody bothers them. They bother nobody.
Until said dude's girlfriend moves in.
Stereotypically, the female decides this place needs cleaning and what we get is Armageddon seen from the floor.
Of course there's your rivalries between the peace-nicks and the aggressors. And Naomi is our female eye of the storm. Do they fight, run, or die? Find this to find out. It isn't easy. Not even in Japan. There are a few old VHS copies floating around the used shops however.
This combination of live and anime reminds one of "Heavy Traffic" at times. I caught this in an art theater in Philly during a run on rare anime showings. Didn't stand out like "Robot Carnival" but still kept my attention.
And anyone with knowledge of Japanese life might like it too.