One Piece: My Crew Uses Zanpakuto

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Robin didn't doubt what Ikki said.

His ability to find Alabasta's underground ruins and the poneglyph hidden within was enough to prove he had significant knowledge about these ancient artifacts.

Plus, Ikki always seemed to know where famous swords could be found throughout the sea.

Robin had long ago determined that Ikki possessed extraordinary intelligence-gathering capabilities.

If he said poneglyphs were in the hands of the Yonko, it must be true.

"Yonko? What's that... are they strong?" Nami blinked and asked with confusion.

"The Yonko are much stronger than the Shichibukai," Robin explained. "They rule the second half of the Grand Line, the New World, and their status is truly that of emperors. Not even the Marines or World Government can challenge their position."

"To put it simply, the weakest among the Yonko may be stronger than a Shichibukai like Crocodile," she added with a soft sigh.

As someone who had wandered the seas for many years, Robin had never personally encountered any of the Yonko, but she'd heard plenty about them.

Even Marine Admirals didn't dare confront the Yonko carelessly.

"Since they're such powerful people, can we actually beat them?" Nami asked, shuddering slightly as she looked quickly at Ikki.

"Haha, of course we'll surpass them," Ikki replied confidently. "Otherwise, it would interfere with my collection of famous swords. According to my information, one of Charlotte Linlin's children has a famous sword I want."

"Wano Country, where Kaido rules, also has many famous swords I need. Additionally, both Whitebeard and Red-Haired Shanks wield famous swords. If I don't surpass them, it'll be quite problematic."

Ikki smiled confidently. Though his current strength wasn't equal to the Yonko, and defeating even a Marine Admiral would depend on the circumstances, both he and his crew had grown tremendously in a short time.

Ikki believed that with enough time, he could succeed even in taking Whitebeard's Supreme Grade sword, 'Murakumogiri'.

"What a bold statement," Robin remarked. "If anyone else said this, the world would consider it a joke. But coming from you, Ikki, I think you might actually accomplish such a feat."

She nodded and looked at Byakuya Kuchiki who still stood before them.

"If everyone on the Explorer could use Zanpakutō to this extent, we might actually be able to defeat the Yonko together."

Hearing Robin's words, Ikki's lips curved upward.

The next moment, the cherry blossom blades surrounding Byakuya transformed once again into thousands of slender swords, all pointing in one direction.

"Ikka Senjinka!" Byakuya murmured softly.

In the next instant, thousands of blades flew toward Ichigo Kurosaki.

There was a deafening roar as the entire world seemed to be engulfed in the light and shadow of countless swords.

"This power... it's truly incredible," Robin couldn't help but exclaim as she witnessed the spectacle.

Ikki placed his hand on Robin's shoulder and smiled.

"It won't be us working together to defeat the Yonko," he said. "If possible, I hope each of you will have the ability to challenge a Yonko individually."

Robin looked at Ikki in shock.

"A one-on-one duel with a Yonko? Is such a thing really possible?"

"I believe it is. If you can use your Zanpakutō to this extent, and reach the level of a great swordsman, you could fight even a Yonko," Ikki stated firmly. "If you follow me, you should at least have this level of ambition. Robin, after hearing this, do you regret becoming my crewmate?"

Ikki laughed softly.

"Not at all," Robin's lips curved into a smile. "Since the Yonko possess poneglyphs, fighting them is inevitable. Don't worry, Ikki. In the coming days, I'll train diligently and strive to become stronger."

After Robin finished speaking, Vivi and Nojiko nodded in agreement.

"Seriously? Even the Marines don't dare underestimate these opponents," Nami groaned, holding her face with a hint of fear in her eyes. "You're way too optimistic. I just wanted to sail comfortably, why do we have to target those monsters? Can't we take it easy with the training?"

"You just want to be lazy," Ikki said with mock irritation. "As the strongest person on the Explorer besides me, you need to set an example for everyone! Come, let me motivate you."

Ikki dismissed the Senbonzakura demonstration, returning the sword to its scabbard at Robin's waist.

He put his hand on Nami's shoulder and pushed her toward the arena.

"No, I haven't rested enough!" Nami protested.

"Nami, how can you think about rest at a time like this? Come, spar with me to improve your combat awareness."

"No, at least let me fight someone else, not you, Ikki."

"Absolutely not! I want to be your opponent this time, so get ready. By the way, I forgot to mention, the Yonko are incredibly wealthy. If we defeat them, we'll definitely collect lots of treasure."

"What? Treasure?! Come on, Ikki, train me hard! I want to get stronger quickly!"

Hearing the word "treasure," Nami's demeanor immediately changed. She grabbed Ikki's hand and practically dragged him into the arena.

'This girl... is money really her only motivation?' Ikki thought, looking at Nami with a mixture of amusement and shame.

He shook his head and contacted the system in his mind.

'System, use the lottery chance from uploading Sandai Kitetsu.'

[Starting lottery... Congratulations to Host for winning: 'Advanced Observation Haki Awakening Potion']

'An Advanced Observation Haki Awakening Potion? What a stroke of luck.'

The corner of Ikki's mouth turned up. Teaching Hina had been worthwhile after all, since she'd given him the opportunity to claim Sandai Kitetsu.

After entering the arena with Nami, Ikki took out the 'Advanced Observation Haki Awakening Potion' and drank it.

"Ikki, what are you doing? We're just about to spar and you're taking enhancers?" Nami pulled out her sword and immediately pouted, looking at Ikki accusingly.

"Haha, don't worry. You couldn't beat me even without this, right? If I become stronger, maybe I'll be less likely to hurt you when we spar," Ikki said with a smile, eager to test his newly acquired Advanced Observation Haki.

As his Observation Haki expanded, Nami's aura immediately became clear in Ikki's mind.

Unlike before, he could now clearly sense the powerful energy surrounding her body.

It was as if he had a combat effectiveness detector right in front of his eyes.

'I see, Intermediate Observation Haki allows users to focus their perception in one direction, increasing detection range and sensitivity along that line,' Ikki thought. 'And Advanced Observation Haki strengthens the ability to sense others' aura strength, emotions, and intentions?'

Ikki's eyes narrowed slightly. He could clearly feel the excitement emanating from Nami.

He could tell she was looking forward to their sparring session.

When Ikki focused on Nami's breathing, he found he could clearly perceive some of the signals her body was sending about her upcoming movements.

He had experienced this feeling with lower-level Observation Haki, but never as clearly as now.

'So this is Advanced Observation Haki. Not bad at all. If I weren't in the arena, the range of my perception would probably be much greater.'

'But why can't I "see the future" or truly read others' thoughts yet? Are those special abilities I need to get through the lottery? Or are they simply obtained through training?'

Lost in thought, Ikki didn't notice Nami preparing to attack.

"Seriously, Ikki," Nami pouted. "Even if I'm not a match for you, at least pay attention!"

She released her Shikai Gonryōmaru, sending a string of lightning toward Ikki.

When the lightning reached him, Ikki activated his Transparent World ability and engaged with Nami.

As the sparring continued, Ikki began to experience something strange.

Though Nami hadn't yet swung her sword, in Ikki's mind he could already see her swinging it in a specific direction!

'Is this... Future Sight?'

'Could it be that Advanced Observation Haki combined with the Transparent World ability unlocks the Future Sight aspect of Observation Haki?'

Ikki was surprised. While evading Nami's attack, he checked his personal attribute panel:

[Host: Ikki]

[Age: 25 years old]

[Weapon: Zangetsu]

[Life Force: 30550, level S]

[Swordsmanship Realm: Mountain-Cutting Realm]

[Abilities: Intermediate Armament Haki, Advanced Observation Haki (Future Sight), Intermediate Conqueror's Haki, Conqueror's Haki Infusion, Transparent World, Demon Slayer Mark, Geppo]

[Swordsmanship Schools: Demon Slayer Breathing Techniques, Zoro's Three-Sword Style, Tashigi's One-Sword Style...]

[Items: E-level nutritional potion x4, D-level nutritional potion x1...]