So Kei is like Makise Kurisu a closet internet meme lord doing the all new leg up pose. Even though it looks like she yanked her leg out of her hip joint while also having incredible core muscles so she doesn't fall over without rebalacing from standing on one leg.
Hayasaka cosplaying is a dream come true. I've always worshipped Hayasaka x Cosplay. Splinter Cell, Haysaca, Haysaca-kun, Gyaru and now we can Santa, Devil and Maid to that list... I think I now know how those always feel.