This was a full page ad in the Right Stuf! anime catalog
I thought her spine was the most distressing thing and then I realized… those things at her sides are part of her costume… I legitimately have no idea where her arm is….
She’s very centaur-y.
Her arm could conceivably be behind her back but that would mean going through the sleeve. Given her sleeve, I think it’s *meant* to be back against her butt, but it does look like it just vanishes.