One Piece: The Soul Purchasing Pirate - Chapter 94

As the head disciple of the number one sect in the world, Luo Jianqing had a brilliant reputation. He was the most respected senior brother of his junior brothers and sisters: the last disciple of the cultivation world’s number one cultivator, Luo Jianqing greatly respected his master’s teachings, not crossing his limits by even half a step.

Afterwards…… he was stabbed to death just like that by the main character with his sword. His master’s sword.
Luo Jianqing: “……”
The heavens wants me dead, yet I refuse to die! See if the will of the heavens is more fearsome, or if the will of my sword is more stubborn!

Wu Yin: “Jianqing, I have something to say to you.”
Luo Jianqing: “Master, I also have something to say to you.”
Wu Yin: “… you speak first?”
Luo Jianqing: “You speak first.”
Wu Yin: “I like you.” / Luo Jianqing: “I want to top you.”
Wu Yin: “……”

- Description from Novelupdates

The Dao Court has ruled the world of cultivators for over twenty thousand years. The noble families maintain a strict hierarchy, making life difficult for independent cultivators.At ten years old, Mo Hua, who comes from a background of independent cultivators, struggles with his cultivation journey. This changes when a Dao stele appears in his mind.The stele is damaged and mysterious, but it can enhance spiritual awareness and help understand mystical formations.Mo Hua plans to use this stele to develop a supreme spiritual awareness, learn the secrets of celestial formations, and pursue the ultimate path of immortality. His goal is to change not only his own destiny but also the destiny of all lesser cultivators across the world.The path to greatness starts with the smallest steps, and the journey to immortality is long and challenging.Through dense fog and treacherous terrains, past horrors and chaos, where demons dance wildly, he must plant the seeds of his spiritual quest, survive the deadliest of trials, and prove his worth on every dangerous step…In the grand scheme of heaven, where the universe is the game board and all creatures its pieces, the strategic game of life and death begins, shaping destinies through its intricate moves…

A side story series featuring the girls of Kyoukai Senjou no Horizon.