The Yin-Yang Sword Wheel

[System] + [one heroine] + [Cultivation] + [Swordsmanship] = ???

There are no Night Watchmen. There is only a blind young man’s dream before he leaves the psychiatric hospital.

There are no Dou Di. There is only the dream of a fallen young master whose engagement was broken off.

There are no Sea Gods. There is only the last wish of a young man who fell off a cliff and lay dying.

If Li Tianyi had not been born, the sword path would have languished in darkness for eternity. With one sword, I open the gates of heaven; with one sword, I slay immortals. Alone, I battle thirty emperors; with twin swords, I sweep across thirteen realms. Three million sword immortals roam the world, yet all must bow their heads when they meet me. The madness of the immortal, pride above the world: with my sword, there is heaven. The great river’s sword descends from the sky; one sword spans the heavens and suppresses the world. I shatter the mortal world and slay every immortal; sword in hand, I cut through the nine heavens! If there are no true immortals in this world, I will wield my sword and become one. And when the sword comes, heaven follows; I’ll spit in the face of the firmament and curse the gods! Sword, come!!

(The blurb does this story no justice. I beg you to move on to the main text.)