Feitian's Sword Slashes the Red Pupil

[Single female protagonist] + [No system] + [No be] + [Decisive killing] The senior brother who traveled through time and became Kenshin, he took Feitian Yujian style and fell into the world of the red pupil. The empire is decayed, the emperor is ruthless, and killers are stalking, and everything is desperate. The black stone that appeared inexplicably in the palm of his hand became his only support. After being brought back by Leonai for a night attack, where should he go? This time, I flew into the sky with my sword just to kill all my regrets.