Filming a rap music video.

The text is simple, eg. "I am the best, I am the coolest and Imma snuff that bitch" repeated over and over again (no that much worse than some actual rap, eh?)

Whenever the second part of that is rapped, the music video show a woman being snuffed. The story is about how these individual scenes are filmed and how the actresses voluntarily and eagerly do what the band wants them to do (eg. shhot a gun into their pussies, beat them with a baseball bat, put them into a pool head down while fucking them, inserting exploding dildos into their pussies,...) The atmosphere during the shooting is relaxed and easy-going, but the action is extremely brutal.

Filming a black metal video

The atmosphere during filming is also relaxed and easy-going, but what is being displayed is much more brutal and cold, eg. women being gutted and left to rot, freezinh to death, using a chainsaw to dismember them....

Warhammer 40k

Based in the WH40K universe.

In the grim darkness of the future there is only war. In the story to the movie, however, the Imperium of Man has found a new way how to keep its enemies in check more efficiently. Instead of sending millions of billions of men to fight and die against chaos, orks, dark eldar, tyrannids,... the Imperium has decided to send women to be killed by these enemies.

The four gods of Chaos:

Khorne loves to maim and kill, if enough women are delievered to him to give him blood for the blood god, skulls for the throne of khorne, he is happy
Nurgle loves to humiliate the women, let them suck his rotting cock and also scat, and then by doing all sorts of really nasty thing and finally slowly being rotten from inside
Slaanesh: That's easy, he's a textbook sexual sadist
Tzeentch: He's a weird guy, maybe likes to make them crazy in their mind.

Orks: At least in the story to the movie very horny, cocks big enough to rip their share of women to pieces but also maim and torture them otherwise for their own enjoyment

Dark Eldar: Love to torture in the most brutal way so that their souls are not consumed by Slaanesh, fit the story perfectly

Tyrannids: Just eat the women, hard vore

So finally in the grim darkness of the future their is peace for the Imperium of Man, for a change it's the women that are sacrificed in the fight against the enemies of the Emperor.