Thistle was trying to remember their wish that they made with Derghal, but all they can remember is the winged lion, because the winged lion ate that strong desire. Thistle doesn't actually remember it anymore.
Ahh, the rare double-blind isekai. Both the villainess and the heroine are isekai protagonists, but neither realizes what the other is. Naturally the heroine thinks the villainess is a giant piece of shit, while the villainess is... A dumbass shoujo protagonist, as usual. Interesting take but...