(Naruto fanfic + Gu cultivation + No system + No heroine + Dark theme + Extreme self-interest)

(Note: You don’t need to understand Gu techniques to enjoy the story, the protagonist’s Gu are all based on elements from the Naruto world.)

Fang Yan transmigrated into the Naruto world, expecting the usual protagonist treatment:

Admiring beauties? Bonds of friendship?

What he got instead was the surgeon's scalpel in the Root laboratory and brutal death training.

His only lifeline, were the Gu worms inside his body.

To survive, Fang Yan must stop at nothing.

Friends? Heroines?

They’re nothing more than fodder for refining Gu!

He devours Root. He devours Konoha.

He devours the entire Shinobi world.

“Fang Yan, you’ve gone astray. It’s not too late to turn back!”

But just when everyone believes the battle is over, Fang Yan raises a single finger and shatters every illusion.

“Turn back? I, Fang Yan, have never done a single thing wrong in my life. Why would I repent?”

In that moment, all the cocoons on the battlefield burst open

A flood of chakra from ten thousand bodies surges into Fang Yan.

“A raft of blood sails the River of the Dead,

A thousand corpses form a ladder to the heavens.

Ten thousand Gu devour my soul, yet I have no regrets.

I will prove the Gu Dao and defy the heavens themselves.”

In a single night, two great bloodline clans were wiped out, and Konoha issued an emergency notice:

Uchiha Itachi – S-rank rogue ninja, the infamous exterminator of the Uchiha Clan.

Hyūga Gakuya – S-rank rogue ninja, the infamous exterminator of the Hyūga Clan, who seized their bloodline inheritance.

Born from the union of a Hyūga and an outsider, Hyūga Gakuya was scorned as a disgrace and treated as a branch family servant. From a young age, he suffered constant oppression, and while he narrowly survived due to his inherited bloodline, even his closest relatives were relentlessly persecuted by the Hyūga main family.

Now, only one thought dominates Hyūga Gakuya’s mind—destroy the Hyūga! But his current strength is not enough; he needs more power!

…

Years later, Hyūga Gakuya annihilated the entire Hyūga Clan. Hundreds of Hyūga bodies vanished without a trace, all consumed as nourishment for his Tenseigan Awakening.

The ninja world lost a member of Konoha’s Anbu…

And gained a Hyūga unshackled from his chains—a ninja who defies the rule of the Great Nations!