Caged Bird Seal? It's Just a Simple Sealing Technique.

In Uchiha Ensei's impression, the Hyuga Clan was practically synonymous with cowardice.

After all, when that clan had a child kidnapped, not only did they fail to seek revenge, they instead made the younger brother commit suicide, take his elder brother's place, and then sent his corpse to the enemy.

And there was also that rule that forcibly split a single clan in two, turning blood brothers into something like slaves.

It was only because Uchiha Ensei had not been born into the Hyuga Clan. If he had been a Hyuga, even as a member of the main family, he probably would not have been able to tolerate such a twisted system.

Still, seeing that Hyuga Hiashi actually had the courage to reform the clan's rules made Uchiha Ensei view him somewhat more favorably.

"I need the Hyuga Clan's records on the Byakugan—the most confidential ones, the kind only the main family can inherit. Preferably including secrets passed down only by word of mouth."

Uchiha Ensei did not stand on ceremony. After agreeing to Hyuga Hiashi's request, he began listing a great many demands.

Hyuga Hiashi's expression turned grim in the face of those demands.

To a clan, the inheritance of secret techniques was practically equivalent to its own Kekkei Genkai.

If it was casually divulged, the entire clan could very well vanish amid such a crisis.

But on further thought, the other party already possessed more Byakugan than existed within his own clan. When it came to bloodline, it was hard to say who truly counted as the main family.

The more lice you had, the less they itched; the more debt you owed, the less you worried.

In the end, Hyuga Hiashi very reluctantly produced a large number of documents, including quite a few carved onto stone tablets,