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Thinking of the various awesome skills of the Thunder Fruit, Kaito felt a surge of excitement.
(I'd start refering the Mc as Kaito instead of Arata to avoid confusion)
"System! Extract the Thunder Fruit!"
A dazzling white light appeared, and a fruit with purple threads—resembling a pineapple—materialized in Ayanami Kaito's hand.
[Extraction successful!]
Kaito stared at the fruit, exhilarated. This was his key to true power.
Without hesitating, he shut off his smell and taste senses and ate it whole.
He remembered from the anime that Devil Fruits tasted awful—like garbage.
Yet at the first bite, a sweet and fruity aroma filled his mouth and nose.
His eyes lit up as he swallowed the rest in large gulps.
[This is an improvement of the system!]
The system acknowledged his thoughts.
Kaito waited, but after one second… two seconds… nothing changed.
He frowned. "What's going on? Is the Thunder Fruit powerless in the Naruto world?"
Just then, curled on the tatami, he doubled over in pain.
His face twisted, muscles convulsed.
Pain!
It felt like millions of ants burrowing into his organs.
As if invisible thugs had shattered Ayanami Kaito's bones, poured molten metal in, then remolded him.
"Ah!" He groaned, vision blacking out, and lost consciousness.
When he woke up, his body felt strong, strengthened. It was exhilarating.
The system probably improved the devil fruit.
Glancing outside, the sky was pitch black.
"How long have I been out?"
Dragging himself to the bathroom for a shower, he felt sticky and sour.
Stepping off the tatami, he noticed a tiny ball of blue energy in his abdomen.
Though faint—hair-thin—it lit up Kaito's eyes.
Chakra!
The essential energy for a ninja.
In the shower, he clenched his fists. The Thunder Fruit had granted chakra—but how to unleash its lightning?
A subtle flow of chakra sifted through him.
A faint blue arc flickered on his fist.
"This is it!" He realized.
"Disappear!" he willed—the electricity vanished.
"Appear!"—it returned.
Determined, Ayanami Kaito kept it active, transforming his entire right hand into a crackling arc of blue lightning.
By the time it reached his wrist, he turned pale and weakened—it was his limit.
After dissipating the energy, his body and chakra core were drained.
In the One Piece world, Devil Fruit users relied on brute strength.
Here, he needed both chakra and stamina—this world's rules didn't shield outsiders.
After showering and eating a quick meal, he attempted chakra training, but remained exhausted.
Back in the bedroom, an idea struck.
"I already have a god‑level training space—why train normally?"
No need to struggle when you've got cheats.
"System! Does my body or my soul enter the training space?"
[Soul. The main body will sleep deeply. Upon the soul's return, all training will apply to the body.]
"System! Enter training space!"
Eyes closed on the tatami, his mind spun. Opening them—he was in his living room.
"This… this???"
[Host, don't panic. We've loaded a scene from Konoha Village.]
Kaito touched familiar furniture in awe.
"It really works—this system is flawless."
After satisfying his curiosity, Ayanami Kaito sat cross-legged and began refining chakra.
This is a ruthless world: the strong thrive; the weak are prey. Only strength grants freedom.
Chakra arises from the body's trillions of cells plus spiritual energy from training and experience—essential for ninjutsu.
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