Naruto: Cultivating Immortality with Naruto and Sasuke in Konoha's Demon Cave

[Anime, fan fiction, System, wild imagination, invincible protagonist, comedy, Naruto, Konoha] After transmigrating into Naruto and awakening the Cultivation and Enlightenment System, Xiu Yan opens his eyes to find Naruto, a "born Daoist immortal," being refined into an elixir by demonic cultivators, while the Nine-Tails Fox has been imprisoned. He immediately pulls out a cultivation manual. "How dare a mere low-level demonic lair act so boldly!" Ling is forced to protect her favorite, swallowing her grievances! He tosses out a Bigu Pill that bursts the Anbu's meridians, gives the Nine-Tails the Heavenly Fox Breathing Method so it willingly becomes a guard, summons heavenly lightning on the night of the massacre to blast off half of Danzo's body, and forcibly takes Sasuke, who has sword bones! While the Third Hokage and the other higher-ups are terrified by this mysterious old monster, Xiu Yan discovers that chakra isn't some supernatural power at all. It's a bloodsucking parasite planted inside every living being by demons from beyond this world! When Kaguya Otsutsuki descends with the Divine Tree, a hundred thousand Golden Core sword cultivators, each riding a flying sword, await her.