Toaru Majutsu no Index - Volume 8, Chapter 3: Hiding Lit Debris. "Remnant"

After a mishap, he accidentally became the protagonist. Unexpectedly, he and the villain cultivated together and they actually became dao companions.

“If you want to be with me forever, there is only the supreme road of achievement. Are you willing to travel with me?”

“Of course I’m willing.”

……

In Li JinZhi’s view, the protagonist and villain’s coexistence should be like swords and spears facing each other, a feud.

But when he crossed into the novel and became the protagonist; when he placed all his trust in the man who was supposed to be the villain; when the other side revealed some unusual feelings to him; when he held Ye Yu’s hand to the altar, he discovered that the relationship between the protagonist and villain isn’t as dull as he imagined.

When the monotonous pattern is broken, the feelings of resentment turns into sharing a common destiny.

- Description from Novelupdates

Aiden Cross, A boy who was smarter than a kid his age. Born on the seemingly normal planet Earth. who finds his life very boring.100 years ago, World War III happened for unknown reasons. Resulting in 25% of the world population perished in this war.What was the reason for all the nation to fight for?Would he uncover the secret of the war? Or will he become a pawn of the powerful organizations?But one day Aiden’s life turned upside down in an accident. Aiden lost his mother, and Aiden himself was on the verge of dying. Then he awakened the system.[Ding][Compatible host detected][Initializing the Cosmic System][Connecting the cosmic system to the host's soul][Connection Completed]A system promises to make him stronger and help him revive his mother back to life. And inform him about the awakening of his world, which is no less than the apocalypse. With the help of the system, Aiden awakens Limit Grade Talent, but his talent is not complete and has a fatal side effect.[Talent: Celestial (unknown)] (incomplete)Aiden has to copy many talents to complete his talent. And travel to many different worlds.As he meets different races, a naive elven princess, prideful and lustful dragons, bored vampires, and a horny angel who offers herself to him“I offer you my body and soul; please accept me.” An angel with a flushed red face said

Nexus found himself transmigrated into an isekai of magic, where he encountered a captivating Dual Cultivation System. Realizing the importance of this system for his progress, he embarked on a quest to seek out girls who would wholeheartedly participate in the practice of dual cultivation alongside him. Failure to find willing partners meant that his ability to upgrade and advance would be severely hindered.

Unfortunately, it appeared that the inhabitants of this magical isekai realm were oblivious to the concept of dual cultivation.

Thankfully, within this realm, there existed a race known as succubi. These non-human beings possessed the ability to nourish themselves through the consumption of men's semen. Regrettably, they were considered undesirable by humans. Yet, Nexus discovered that he was an exceptional match for these succubi, forming a natural bond that made them highly compatible partners.

Furthermore, Nexus encountered a stark contrast between the techniques described in the Xianxia novel he possessed and the actual magic present within the isekai realm. The disparity was substantial, requiring him to invest a considerable amount of time to acclimate himself to this unfamiliar form of magic.

With his newfound allies, Nexus set out to make a profound impact on this new world.

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After a mortal accident left him dead, the soul of Wang Wei was sent into the sacred body of an unborn child in an ancient world of cultivation where only the strongest survives.

Along with the ancient soul of an immortal taoist, follow Wang Wei from a small clan as he strives to carve a name for his clan and himself.