Who are these two girls appearing in the OP of Shuffle?


At around [1:10](https://youtu.be/9GQF1_PUTqE?t=71) in the opening of
_Shuffle!_ , there is a shot picturing two girls that seem to never appear in
the anime.[![enter image description
here](https://i.stack.imgur.com/cxcXh.png)](https://i.stack.imgur.com/cxcXh.png)

Who are they? What's their arc/story?




It's been a long time since I've played the original VN or watched the anime,
but are these not Rin and Sia as imagined in their respective kingdoms?
Matching features and both are princesses (kingdom of devils and kingdom of
gods respectively) before coming to the human world.

