There might be some vague connection between her and Keine. Aside from the fact that both were messed with by the moonies, Keine's first two spells make reference to the pyramids and Jimmu's short lifespan.
Did we just get IN2?
>>49875399
Iwanaga-hime, who represents immortality and stone, wasn't seen as beautiful because she wasn't ephemeral, not necessarily because of her actual looks. I think she looks quite cute and dashing.
Her sister, who Ninigi-no-mikoto ended up marrying, is named Konohanasakuya-hime(no relation to Sakuya, they use different kanji), who's name means "Blooming tree flower princess" and she is represented by cherry blossoms, so she symbolizes ephemerality, which is why she was considered more beautiful.
In some versions of the myth, Iwanaga-hime doesn't curse anyone, and the shortened lifespans are a natural consequence of not marrying her. In others, she curses all humanity. Perhaps a slightly extreme reaction.
>>49875870
lol.
>>49875697
She looks somewhat avian. I wonder where all of her design details came from.

Ariya is the first 2hu I like since Sagume, I hope we see more of her. Her fight is my new favorite final boss fight.
Anyways, here's my shitty little drawing of her. It's a little off model and the proportions are messed up, but by the time I realized it, I was too tiered to redo it. I also gave her socks because I don't know how to draw feet(also so she doesn't catch a cold)