It appears Keyaru just rapes Flare exactly once (as Flare) and then erases Flare to become Freia.
What's the point? Well yeah now you're getting your revenge on Flare's BODY. I don't see the actual revenge on Flare. Why not just continue to drag Flare around as still Flare? Like somehow Keyaru, now Keyarga, really derives vengeful pleasure from this erasure and just the ONE time ? Or is Flare actually still at the back of Freia's mind trapped in some mind prison?
If the eventual goal to erase Flare to become Freia, then why rape Flare (as Flare) exactly once? Why not zero times? And if not zero times, then why not, like, 10 times? Is Keyaru really satisfied with exactly one? Or can Keyaru turn on/off the Freia persona, like temporarily bring back Flare for more?
Just finished S01E02: I don't see any indication of an on/off switch or of a mind prison.
Update: Just finished s1. Don't really get it except maybe they don't have the luxury of staying in the room forever because eventually they gotta escape and save the world.