One Piece: My Crew Uses Zanpakuto

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"Are you okay, Hina?" Gion asked with concern, her eyes fixed on Hina.

"Hina is fine, just need to rest for a bit," Hina replied, raising her hand to cover herself. She looked at Ikki accusingly. "By the way, Ikki, you evaporated all the water in the pool. You did that on purpose."

Ikki shrugged, looking helpless. "Can't be helped, it's fire after all. Isn't it normal for flames to evaporate water?"

As he spoke, Ikki raised his hand and snapped his fingers.

The evaporated water immediately filled the bathhouse again, wrapping around Hina's body.

"This water will help you recover quickly," Ikki said. "After you heal up, I'll help you continue adapting to Flame Breathing. Besides, you've got a nice figure, Hina."

Hearing this last comment, Hina immediately frowned.

"You jerk! Hina says delete what you just saw from your memory!"

"Sorry, I've got a pretty good memory, especially for beautiful scenes."

Ikki waved his hand dismissively and turned to Gion.

"Gion, it's your turn next."

When Hina saw Ikki changing the subject to Gion, she could only temporarily give up on scolding him.

"Ikki, you're not planning to burn my clothes off like you did to Hina, are you?" Gion asked with a smile, extending her hand to hold Ikki's.

"Moon Breathing doesn't have that effect, don't worry," Ikki assured her. "But... I hope you can control yourself better and not make those strange sounds like last time."

As he spoke, Ikki's body gradually became surrounded by the feminine aura unique to Moon Breathing.

Several crescent moon energy waves rose up from his hand that was holding Gion's.

Gion's normally smiling face showed a moment of shock. Hearing Ikki's words, she recalled how it felt when Moon Breathing energy first invaded her body.

"Don't worry, Ikki, I'll be careful," Gion nodded firmly.

Obviously, even she was unwilling to show such reactions in front of relative strangers like Hina and Ikki.

"Then I'll begin," Ikki said. "Please don't use Haki or any other energy to resist, Gion."

After Ikki finished speaking, the crescent energy from his body instantly covered Gion.

As the cool energy entered her body, Gion's face first showed surprise, then quickly turned red. Her body began to tremble slightly.

"Vice Admiral Gion, are you... uncomfortable?" Hina asked, looking confused.

"It's not uncomfortable, it's actually... quite pleasant," Gion replied to Hina before immediately biting her lip.

She clearly didn't want to make any embarrassing sounds.

'The effects really are different for different people,' Ikki noted mentally.

"You have high compatibility with Moon Breathing, so your experience is different from Hina's," Ikki explained. "Since your compatibility is so high, I'm going to increase the intensity."

Ikki warned Gion, and when he saw her slight nod, he suddenly increased the flow of Moon Breathing energy into her body.

Even though Gion was prepared, she couldn't help letting out a soft moan.

Hina, who was watching Gion, had a strange expression on her face.

'Is it really that pleasant?' she wondered. 'Does Hina really have no talent for Flame Breathing? Is that why it felt so uncomfortable?'

Looking at Gion's intact clothes and her own still-reddened skin, Hina couldn't help but sigh.

Perhaps it was because Gion was naturally more compatible with breathing techniques.

This time, Ikki's guidance for Gion took a full three hours to complete, which was eighteen times longer than Hina's session.

"How do you feel, Vice Admiral Gion?" Ikki asked with a smile as he released Gion's hand.

"I feel great. My physical condition has never been better," Gion took a deep breath, calmed her mind, and then spoke. "The breathing swordsmanship you've mastered is truly unique, Ikki."

"When you completely master Moon Breathing, you'll feel even more special effects," Ikki smiled. "Rest for a while first. In a bit, I'll help you adapt more to this breathing style."

As they were talking, the bathhouse door was pushed open.

Ikki turned around and saw Nami, Nojiko, and Vivi walking in with light steps, all sweating profusely.

Ikki glanced at the attributes of the three women and immediately knew they had used A-level nutritional potions and had completed their training.

"Hope we're not interrupting," Nojiko said with a smile as she approached Ikki.

After seeing Hina's situation, the smile on Nojiko's face seemed to grow even wider.

Facing the gazes of Nojiko, Vivi, and Nami, even the cold-natured Hina couldn't bear it. She quickly turned around to face away from them.

Meanwhile, Gion's eyes were fixed on the three newcomers.

'Their auras seem stronger... is it my imagination?' Gion frowned as she carefully observed Nami, Nojiko, and Vivi.

"Ikki just finished using his special training method on me and Hina," Gion said. "You three look pretty sweaty. Did you just go through some special exercise too?"

Gion's eyes lit up with curiosity as she asked.

"Just normal workout in the gym for a few hours, nothing special," Nami replied casually, waving her hand.

Of course, she wouldn't mention the A-grade nutritional potion since Ikki had warned her not to.

Though Gion seemed a bit confused, she didn't press the issue. She simply filed away her suspicions.

"Ikki, aren't you going to bathe in the hot spring?" Nami asked with confusion after she put on her bathrobe and stepped into the pool.

"I'd like to, but I'm worried a certain lady might object," Ikki said with a smirk, looking at Hina who had her back turned to everyone.

Hearing this, Hina immediately spun around and glared at Ikki.

Ignoring her glare, Ikki stepped into the pool. At the same time, he activated his Demon Slayer Mark.

Instantly, the flame-shaped mark on the right side of his forehead expanded to several times its normal size.

"Ikki, what are you doing?" Nami asked, looking at the Demon Slayer Mark on Ikki's forehead with confusion.

"Nami, don't you have a major challenge ahead?" Ikki asked with a laugh. "My Demon Slayer Mark can influence you and help you develop the same type of mark. If you can activate a Demon Slayer Mark, completing your future training tasks should be much easier."

Nami nodded, understanding that Ikki was referring to the challenge of "20-year-old Gion's Sword Shadow."

"In that case, I'll stay closer to you, Ikki," Nami giggled and moved nearer to him.

"By the way, do I need to do anything special, Ikki?"

"No, just stay close to me."

"That's it? Well, how about I scrub your back?" Nami chuckled and raised her hand to remove the towel wrapped around her hair.

Before Ikki could refuse, she pushed him to the edge of the pool and began to wash his back.

'Activate a Demon Slayer Mark?' A thoughtful light flashed in Gion's eyes, and she moved forward to sit closer to Ikki.

Nojiko and Vivi did the same, but Hina remained at a distance, watching Ikki suspiciously.

Ten days later.

Alabasta, Sword Training Room.

[Ding! Congratulations to Host's partner Nami for reaching S level. Special reward: 'Intermediate Observation Haki Awakening Potion' x1.]

'Finally reached S level?' Ikki thought. 'And the reward is an Intermediate Observation Haki Awakening Potion. Nojiko can use that. Nami's getting stronger first and pulling the others along.'

Hearing the system's sudden notification in his mind, Ikki's lips curved into a slight smile.

He checked Nami's personal attributes panel:

[Name: Nami]

[Age: 18 years old]

[Weapon: Gonryōmaru]

[Life Force: 30210, S level]

[Swordsmanship Realm: Iron-Cutting Level]

[Swordsmanship School: Thunder Breathing, First Form]

[Special abilities: Intermediate Armament Haki, Intermediate Observation Haki, Demon Slayer Mark]

'Huh? Demon Slayer Mark? SHe already got it?' Ikki wondered, his eyes showing confusion as he noticed the words 'Demon Slayer Mark' on Nami's personal attributes.

'She didn't have this before. Could it be... because her life force broke through to the next level, bringing her physical condition closer to mine? Is that why she also developed a Demon Slayer Mark?'

After thinking for a moment, understanding dawned on Ikki.

Over the past few days, he had activated his Demon Slayer Mark and spent a lot of time with Nami.

That must have laid the foundation for her to develop her own mark.

It made sense that reaching S-level life force would activate the Demon Slayer Mark.

'With these attributes and her Zanpakutō Gonryōmaru, she should have a chance to defeat 20-year-old Gion's Sword Shadow,' Ikki thought. 'Looks like we'll soon see Nami's Bankai Gonryōmaru.'

Thinking about how he could use Nami's Bankai after she achieved it, the corners of Ikki's mouth turned up involuntarily.

"What are you thinking about? Can you take Hina seriously?" Hina frowned as she looked at Ikki, who seemed lost in thought yet was still easily handling her attacks.

"Sorry, I was thinking about something good," Ikki replied.

"You really are an annoying man!" Hina pursed her lips and took a deep breath.

"Flame Breathing, Ninth Form: Rengoku!"

With a shout, the Sandai Kitetsu in Hina's hand carried scorching flames and launched at Ikki like a meteor.

Seeing Hina's Flame Breathing form, Ikki nodded with satisfaction, raised his hand and performed the same move as Hina, deflecting her attack.

At the same time, a system notification sounded in Ikki's mind:

[Congratulations to Host for defeating novice swordsman Hina. You can now claim Hina's Sandai Kitetsu.]