Kyoya's Observation Haki comes from the reward of the One Piece Achievement System.
Though Kyoya doesn't understand how the powers of the two worlds manifest in his body, the fact remains that he can use Observation Haki.
Under such circumstances, whenever Kyoya employs Observation Haki, his state of mind naturally becomes as calm as still water.
This means that when it comes to training in Zanzen, Kyoya holds a significant advantage over other trainees due to the unique properties of his Observation Haki.
"Then, under these conditions, you need to use your perception to sense your Asauchi."
"Once you can sense the Spirit within the Asauchi, you can move on to the next stage of training."
"However, this shouldn't be a problem for you."
"After all, when you selected your Asauchi, you already established a connection with the spirit within it."
Kyoya remained silent.
What he had wasn't a connection with the spirit of the Asauchi… he had simply relied on his Observation Haki's sensing ability to detect the spirits within the Asauchi and chosen the one with the strongest spirit.
However, Observation Haki is his own power.
Using Observation Haki to connect with the Spirit of the Asauchi and using Zanzen to connect with the Spirit within the Asauchi likely made little difference.
After activating his Observation Haki, Kyoya began following the instructor's guidance to interact with the Spirit within the Asauchi, attempting to nurture it.
However, contrary to Kyoya's expectations, the Spirit within the Asauchi showed no reaction whatsoever to his attempts.
Kyoya can also understand this.
The relationship between a Shinigami and the spirit of an Asauchi was akin to that of a simp and their unattainable crush.
The Shinigami was the simp, desperately trying to build a bond.
Some Shinigami were wealthy and powerful (those with immense Reiryoku), some were exceptionally gifted (those compatible with the strongest Zanpakuto), and some were incredibly persistent (simping till the end), eventually winning over their crush and paving the way for further interaction.
This particular Asauchi had no resonance with Kyoya, as it was essentially a forced bride he had taken by sheer force.
Under such circumstances, it was no surprise that the Spirit within the Asauchi remained cold and unresponsive during their first encounter.
After trying for a while and seeing no change in the Asauchi's Spirit, Kyoya stopped focusing on it and instead turned his attention to the One Piece Achievement System within his soul.
When he had selected the Asauchi, Kyoya had heard a 'Ding' sound, indicating that he had unintentionally completed an achievement by obtaining it.
However, the situation at the time hadn't allowed him to divert his attention to check which achievement he had unlocked.
Now was the perfect time to do so..
[Congratulations, Host, for obtaining a Devil Fruit.]
[Will you use the Devil Fruit?] (Using it will grant the gold-tier achievement, [Devil Fruit User])
'Wait, this isn't an achievement notification… it's a prompt about obtaining a Devil Fruit?'
Seeing this message, Kyoya found it both unexpected and yet reasonable.
In the Bleach World, Zanpakuto possessed various mysterious and powerful abilities.
Moreover, each Zanpakuto had only one master.
The same was true in the One Piece World… Devil Fruits granted unique abilities, and each Devil Fruit would only reappear somewhere in the world after its user died.
In Bleach World, there was the Enrakyoten, capable of replicating other Zanpakuto's abilities, while in One Piece, the Yami Yami no Mi allowed its user to steal the powers of other Devil Fruit Users.
Since Kyoya had obtained an Asauchi, the One Piece Achievement System likely interpreted it as him acquiring a Devil Fruit.
Obtaining a Devil Fruit didn't count as an achievement… using it did.
However, after consuming the Devil Fruit, becoming a Devil Fruit User can be considered a gold-tier achievement.
Devil Fruit abilities are powerful skills comparable to Haki.
In fact, for most people in the One Piece World, the boost in strength from a Devil Fruit surpasses what Haki training can provide.
The only question was whether Kyoya, after 'consuming' the 'Devil Fruit' and becoming a 'Devil Fruit User', would still be weakened by Seastone and seawater.
But regardless, for Kyoya at this moment, the benefits far outweighed the drawbacks..
Without hesitation, Kyoya confirmed in his mind-
"Use it!"
Following Kyoya's thoughts, golden light surged from the One Piece Achievement System, flowing through his soul and merging into the Zanpakuto resting across his knees.
Through his Observation Haki, Kyoya sensed the Spirit within the Asauchi rapidly growing as it absorbed these golden particles.
In just a few seconds, the spirit's intensity expanded from a fist-sized flame of soul energy to the size of a basketball, then further swelled to the size of a water vat.
The Reiryoku contained within this Spirit, as sensed by Kyoya's Observation Haki, even surpassed his own by several times.
Right now, Kyoya already possessed 8th-class Reiryoku.
Even if he joined the Gotei 13, he would be considered an 'elite soldier'.
'If the Reiryoku of the Asauchi's spirit was several times greater than my own, that meant it was at least 6th-class Reiryoku or higher.'
'No wonder Shinigami who successfully released their Zanpakuto could serve as seated officers in their respective divisions.'
Clearly, to nurture the spirit within the Asauchi to a level where it could communicate, gain the Zanpakuto's recognition, and achieve Shikai, a Shinigami's own Reiryoku needed to reach at least 6th-class Reiryoku.
Those below 6th-class Reiryoku would never be able to nurture the Asauchi's Spirit to that level.
But now, thanks to the One Piece Achievement System, Kyoya had instantly completed the nurturing process for the Spirit within his Asauchi.
At this point, all Kyoya needed to do was communicate with the spirit inside his Zanpakuto, learn its name, and he would achieve Shikai.
However, when Kyoya swept his Observation Haki over it, he suddenly realized that-
Though the spirit within his Asauchi had indeed been nurtured to the point of Shikai, under his Observation Haki's perception, it was nothing more than a vessel overflowing with spiritual pressure-
Devoid of any consciousness.
It was as if the Spirit inside the Asauchi was just an empty shell.
Right then, another 'ding' echoed in Kyoya's mind.
Shifting his focus back to his soul, he saw a new golden orb floating within it.
Faint words [Devil Fruit User] shimmered across its surface.
[Ding-]
[Congratulations, Host, for achieving the [Devil Fruit User] accomplishment.]
[Would you like to claim the achievement reward?]
'So, this is where the real deal begins...'
Kyoya smirked.