In the final years of the Warring States period, slaughter and madness bred evil spirits, and immortal demons roamed the human world.
Only swordsmen who had likewise mastered the art of immortality could slay demons. As the age crumbled, the spiral of immortality became an endless vicious cycle.
The line between humans and demons had long since blurred.
A girl who was once a dragon had her left arm severed and replaced with a shinobi prosthetic. By chance, she gained immortality and became caught in the whirlpool of this chaotic age.
She swore to put an end to all immortality in this world.
(A story about an immortal swordswoman and demons. The protagonist is single. Its background draws inspiration from Sekiro: Shadows Die Twice, Demon Slayer, Nioh, Vagabond, and Katanagatari.)
