Hyuga Natsu fell asleep.
This time... she slept even more deeply than she had half a month ago, when she was first branded with the Caged Bird Seal.
After all.
Adjusting the Caged Bird Seal had consumed most of her energy.
Hyuga Sho had done this.
Naturally, he had a purpose.
Staring at the sleeping face on the bed...
Hyuga Sho slowly extended his hand and once again placed his fingers on the Caged Bird Seal.
Then...
He sent in Chakra.
This time, he wasn't solidifying the seal's outer appearance as he had before.
Instead, he was engraving the modified Dark Chakra Ninjutsu onto Hyuga Natsu's bones.
As the Chakra flowed in, Hyuga Natsu's brows trembled slightly in her sleep, and her long eyelashes began to flutter as well.
To prevent Hyuga Natsu from waking up.
Hyuga Sho directly made the Chakra flow through her brain.
Making it similar to being struck by Gentle Fist Style.
She entered a complete deep coma.
Little by little, he carved.
Before long, Hyuga Natsu's bones were covered with various formulas.
These formulas were equivalent to a foundation.
They possessed great expandability.
They had been modified by Hyuga Sho using Dark Chakra Ninjutsu as a template.
This formula wouldn't turn Hyuga Natsu's bones black.
Instead, they would remain in a brand-new, dormant foundation state.
Once he subdued Tsunade in the future and understood how to cast the Sealing Formula on her forehead.
He could continue processing and developing these formulas.
Hyuga Sho actually had a guess about the diamond-shaped seal on Tsunade's forehead.
It was probably... some kind of formula for gathering Chakra.
Because Hyuga Sho had attained a high level of mastery in Dark Chakra.
He could see this at a glance.
Clearly.
Tsunade's Sealing Formula was far more advanced than Dark Chakra