"This current age sure is convenient.." Aand one more hint goes in the basket. When are we going to learn about her background? And who, or perhaps what, she is?
I momentarily forgot Tsukasa's name writing this comment, so I opened the first chapter to look, and I spot Nasa uttering a very peculiar sentence after just being rescued by Tsukasa;
"It's like.. she was Kaguya-hime". I wasn't too sold on the idea she's the moon princess previously, but if that's meant to be hint by the author, it sure is a very clear one...