She's the Rubberiest Disciple
At first I was gonna say this might be the most normal pose she's ever been in compared to some of the others that have been submitted to this blog.
But then I looked closer and it looks like the small of her back above her butt transitions into the side of her body and it's kind of terrifying.
(Cover of Kenichi: The Mightiest Disciple, Vol. 11 by Syun Matsuena, submitted by anonymous)