Or it's just a compilation of game over sex scenes. Like so many other OVAs from other eroges. Lol.
Rant Edit: Never assume OVAs to be canon in any way. Because sometimes they show events diametrically opposed to what actually happened in the original eroge.
For example, Koutetsu no Majo Annerose. Its OVA shows heroine get violated by all manner of guys and even impregnated by the villains in the end. Showing male character as a loser cuck who lost everything.
None of that was ever canon in the eroge the OVA was made about. The real state of things was that the original eroge had a bunch of game overs, depending on the choices you made, with each of them booting you out into the main menu (because they are game overs, duh). And what OVA makers basically did, they stringed those game over scenarios into one continuous plot, which made the OVA have a copmletely different plot and tone than that of the original.
It's been over a decade since that OVA released, but I'm still mad about how they butchered it.