[7Th]

OK, Aria is definitely not dying:

Spoiler for TV Asahi summary for episode 24:

It flat out says: "Considering that he is now a worthy Saint, Shaina reveals to Kouga the secret of his birth. Kouga is surprised, but his will to rescue Aria becomes stronger." Everything is pointing to Aria being Kouga's sister for sure and there is no way in hell Toei will kill the sister of the main character.

And most surprising scene of episode 23:

Spoiler for Episode 23...:

Yuna sleeps naked? :O