From a Light Novel and Anime Infinite Stratos. This is the fourth volume cover.
At first I was like “oh just another boobs-butt pose”. Then I thought: wait how does this work? It hurts looking at it. D:
In a future world, young women called Tetrimos are bent into different shapes and forced to fight each other in Tetris: a brutal combat sport where only the strongest survive. S is a young Tetrimo trying to make it in this brutal environment, but when a mysterious rebel faction interferes with the match, she must make a choice: to stay in the only life she’s ever known, or to go with them and discover the horrific secret behind the games? It’s eliminate or be eliminated in…
Tetris: The Manga.