Kujibiki Tokushou: Musou Hāremu ken - Chapter 158

The ordinary 18-year-old Edo, during a nighttime walk, finds himself in a fantasy world where he gains a mysterious power that could shape his destiny.

In the twilight years of the dynasty, treacherous villains rose to power and demons plagued the world.Qin Zheng, bearing a scroll of virtuous deeds, traveled through time and found that by beheading those wrapped in sin, he could attain virtue and enhance his martial arts prowess.Thus, Qin Zheng glanced at the Ghost Head Greatsword in his hand.“The auspicious moment has come, to the execution!”With a great shout, Qin Zheng swung his blade and beheaded his target!!----------------This book is also known as “I've Become an Executioner After Time Travel?” and “Achieving Sainthood Through Merit, I Seek Elevation by Executing Sinners”......

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.