"Not everyone who works hard is rewarded. But! All those who succeed have worked hard!"
— Coach Kamogawa Genji, Hajime no Ippo
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Now, with Nezuko's transformation into a Devil, there was no need to reshape her body, eliminating many concerns.
However, Nezuko was currently asleep. If she woke up during the Devil transformation ritual and didn't see Tanjiro, she might struggle, potentially causing the ritual to fail.
Therefore, Tanjiro's presence was necessary.
Tanjiro nodded in understanding and observed from the sidelines.
Roy then commenced the Devil transformation ritual.
"By the name of Roy Lucifuge, I command thee, Nezuko Kamado, to become my servant Devil, reborn as my Rook!"
As the incantation echoed through the room, a blue magic circle materialized beneath Nezuko, lifting her sleeping form into the air.
A Rook piece slowly floated towards her.
Just then, the Demon blood within Nezuko seemed to sense a threat, causing her to awaken prematurely.
Nezuko's eyes snapped open, and she glared at Roy with a fierce, almost feral expression. She struggled against the invisible force that bound her, attempting to lunge at him.
Unfortunately for her, Roy's magic held her firmly in place, allowing her only futile struggles. However, her resistance prevented the Rook piece from merging with her.
"Tanjiro!" Roy called out.
"Understood." Tanjiro immediately grasped the situation.
"Nezuko, be good... be a good girl..." Tanjiro approached Nezuko, gently soothing her.
Nezuko, who had already overcome the influence of Demon blood through sheer willpower, retained some semblance of reason. Although the stimulation from the Rook piece had nearly caused her to lose control, Tanjiro's calming presence gradually eased her agitation.
"That's it, Nezuko. You're doing great!" Tanjiro sighed in relief as Nezuko calmed down.
He gently stroked Nezuko's head, and she closed her eyes, enjoying her brother's affectionate touch.
"Nezuko, be good. You'll be back to normal soon," Tanjiro whispered.
"Mm..." Nezuko, with her limited mental capacity, didn't understand her brother's words, but she nodded obediently.
Seeing this, Tanjiro stepped back, watching Roy with anticipation.
Once Nezuko stopped struggling, Roy guided the Rook piece towards her.
This time, Nezuko didn't resist the power, and the piece smoothly merged with her body.
A brilliant light enveloped Nezuko.
After a long moment, the light dissipated.
A mature version of Nezuko appeared before them. The bamboo muzzle was gone, revealing her small fangs. A complete Demon horn protruded from her forehead, and her hands had transformed into sharp claws.
This was clearly Nezuko's fully demonized form from later in the story.
Roy quickly checked Nezuko's status.
What he saw brought a wide grin to his face.
During the Devil transformation, Nezuko's Devil bloodline had completely devoured her Demon bloodline. As a result, she retained her Demon abilities even after the transformation.
Nezuko's Demon abilities were quite formidable.
Her Blood Demon Art was Exploding Blood.
She could detonate her own blood at will, creating high-temperature flames to incinerate her targets. This ability had the unique property of burning only what she intended to burn, making it incredibly powerful.
She could also nullify the effects of other Blood Demon Arts and poisons.
Furthermore, she could severely burn Demons, temporarily hindering their regeneration.
When her blood flames were channeled into a Nichirin Blade, it would transform into a crimson blade with enhanced destructive power.
However, using this ability consumed a significant amount of her blood, which was the source of her power as a Demon, so she couldn't use it frequently.
Moreover, Nezuko's strength increased dramatically in her fully demonized form.
In this state, her desire to fight was intense, and her destructive power was immense. Her regeneration even surpassed that of some Upper Rank Demons.
Even if her body were dismembered, she could easily reattach the severed parts with her blood and regenerate instantly.
In terms of regeneration, she was far superior to Devils.
Moreover, the weaknesses of Demons, such as the craving for human flesh and the vulnerability to sunlight, had vanished.
Nezuko was now virtually flawless. Even Roy couldn't gauge the full extent of her power.
However, he estimated that at full strength, Nezuko could at least reach the level of an High-Class Devil.
Nezuko was now even stronger than Roy, her master.
And due to the feedback from Nezuko's power, Roy's own strength had increased to the peak of a Middle-Class Devil. He believed he would soon break through to the High-Class.
Nezuko's full demonization lasted only a moment before she reverted to her adorable, younger appearance.
"Nezuko?" Tanjiro called out hesitantly, still in disbelief.
"Onii-chan!" Nezuko replied with a cheerful smile.
Tanjiro burst into tears of joy.
Roy didn't interrupt their reunion and left the room with Urokodaki.
He then resumed his discussion with Urokodaki about Breathing Styles. After some explanation, he understood the principles of Water Breathing. It wouldn't be difficult for him to master it.
Breathing Styles primarily focused on enhancing heart and lung function.
Through controlled breathing, the blood could absorb a large amount of oxygen in a short time, instantly boosting physical abilities.
The stronger one's physique, the more oxygen their blood could absorb, leading to greater strength enhancement.
Of course, there was more to Breathing Styles than just this. It was this depth that truly impressed Roy.
Breathing Styles had several levels of mastery.
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