"Yuri Between the Female Swordsman and the Lustful Demon Swordsman"

The succubus Rilm, an invader from another world, and the human female swordmaster Mito Mika competed for dominion and clashed swords night after night. Though Mika continued to win successive victories, since Rilm is a succubus and cannot die, through their prolonged battles Rilm eventually became the stronger one... It's like an image of yuri between a woman and a succubus, you see.