The timeline twenty years later.
Konoha's night was as still as a pool of deep water.
In the Research Institute's temporary artifact storage room, two figures huddled over a "tortoise shell" recently salvaged from the seabed, talking in hushed voices.
"Sis, do you think Dad will get mad when he finds out we sneaked in here?"
The black-haired boy rubbed the back of his neck uneasily.
Moonlight slanted through a high window, falling across his tightly furrowed brow.
The ancient object before him resembled a tortoise shell, its surface etched with faded spiral patterns that gleamed darkly under the dim yellow light.
The white-eyed girl gently ran her fingers over the grooves on its surface.
"Huh? Come on, Taichi, aren't you being a little too chicken?"
"It's just some old antique. Besides, it's not like we came here to wreck anything."
As she spoke, a faint chakra glow rose from her palm, and she tentatively probed the tortoise-shell device.
At that instant, the shell, previously as inert as stone, began to tremble slightly. Its markings lit up one after another, and with faint clicking sounds, it unfolded like a blooming flower, finally transforming into a pink turtle.
"I am the Noble Phantasm, Plow. Please allow me to explain the precautions for my use."
"Wow!"
Himawari's eyes lit up as though she had discovered a whole new world.
"Taichi, it came alive! Look, does it need more chakra to charge up?"
Excitedly, she poured in another stream of chakra. The little pink turtle tucked its neck in comfortably, and a brighter golden glow spread across its shell.
"Now confirming the operating procedure. An incorrect sequence will affect operation."
Then Plow seemed to get stuck, repeating that sentence over and over. It could not identify this chakra's information, yet the chakra could