This waking up moment I've shown you, btw, is based on a moment I experienced IRL. I still remember it pretty clearly for such an old memory, given how strange it was.
It happened at kindergarten. I was eating breakfast with a few others, everyone chewing the food by opening and closing the mouth as children do. And out of nowhere, I realized how odd and repulsive it was to chew like this and started chewing normally from this point. It was as if my self-awareness kicked in.
So the idea is that the protagonist was reborn as a wyvern, but the comic starts some time later when this awareness kicks in.
