Crossover Anime: From DanMachi to Becoming a Garbage Scavenging Master

In a spacious training ground somewhere in Dragon Palace, the three brothers, Shark Star, Emperor Star, and Rollover Star, stood side by side in front of Tiger, waiting for him to explain his understanding of Haki.

Tengoku stood by with Alphia and Nanami watching, while Metalia and Negation Princess, who were not present, were currently talking with Otohime in the library.

Tiger stood in the center of the court, rubbing his hands together, looking somewhat uncomfortable.

"Let me make this clear first, my understanding of domineering aura is very superficial—"

"I mainly learned how to use Armament Haki by fighting around while adventuring in the New World, so there's nothing systematic about it."

He continued somewhat awkwardly, "This time, at Lord Neptune's request, I'm here to demonstrate my understanding to you; it's not exactly a formal lesson."

After he finished speaking, a layer of pitch-black aura spread from his right arm, gradually enveloping it from his fingertips up his wrist and forearm, as if the entire arm had been cast into iron.

"This is the basic usage of Armament Haki—"

"It can strengthen the body and significantly increase strength and resilience."

"As a fish, I have a strong physique, so I didn't find it difficult to get started. Although the princes are also mermaids, their foundations are equally solid, so getting started shouldn't be difficult for them either."

"However, getting started and becoming an expert are two different things."

He glanced at Shark Star, a slight smile playing on his lips.

"Want to try it out? You attack with weapons, I'll just block with my hands."

Shark's eyes lit up, and he immediately gripped his trident, assuming an attack stance. Once Tiger was ready, Shark lowered his stance, gathered his strength, and thrust it fiercely towards Tiger's palm—

clang!

Tiger caught the fork tip with his palm without moving an inch.

He gently pushed his palm forward, and the force of the impact was transmitted back along the pole. Shark Star was forced to lift his feet off the ground and staggered back several steps before finally regaining his footing.

He looked down at his hand, then looked up at Tiger, and remarked with some emotion, "This strength... is considerably greater than Father's!"

A low cough came from beside the pillars.

Before anyone knew it, Neptune had walked up to Tianxing's side, and his cheeks were noticeably flushed upon hearing these words.

"That's because I held back!" Neptune snorted. "Looks like I'll have to be more serious next time."

Shark Star felt a cold sweat break out on his back and quickly lowered his head to admit his mistake: "Your son knows he was wrong!"

Neptune regained some face, his tense expression relaxed slightly, and he continued Tiger's words.

"Tiger's Armament Haki is indeed slightly stronger than mine—but there's a reason why I was called the Great Knight of the Ocean when I was young."

He paused, then steered the conversation back on track, "Armament Haki can not only strengthen the body, but it can also be applied to weapons. Strong individuals in the New World wrap it around their blades, making them far harder and sharper than ordinary steel."

"The great pirate who raised the flag for Fishman Island and has protected us ever since—Whitebeard—is also one of the strong who is skilled in this technique."

"It is said that if one can reach the pinnacle of this path..." Neptune paused briefly, "the blade will be permanently tempered with Armament Haki, the color will never fade, and it will become a black sword with strength far exceeding its original quality!"

Tianxing chimed in, "This isn't just a legend. The Black Blade Autumn Water was conceived in this way by the swordsman Longma."

The three brothers exchanged glances, their expressions becoming more excited, and they unconsciously became serious.

"Regarding Observation Haki... I haven't fully mastered it."

Tiger picked up the thread, "People in the New World say that if you take a lot of hits, you'll learn to dodge, and it will happen naturally. I can sense some of my opponents' attack intentions, but it doesn't work every time—"

He grinned. "After all, we merfolk have a rather rough fighting style."

Neptune continued, "After mastering the basics of Observation Haki, in addition to sensing intent, there are mainly two other abilities: sensing existence and sensing intensity."

"Our clan has a training method passed down through generations. I'll take you guys to experience it later. But that's just the beginning. True Observation Haki is honed through actual combat; you can't teach too much from books."

"As for Conqueror's Haki," Tiger spread his hands, "it's said that only the chosen ones with the talent of a king can master it, an ability possessed only by the true strongmen of the sea."

"I've only experienced this once, from a great distance—"

"That sense of oppression is still vivid in my memory."

-----------------

After briefly demonstrating a few Haki techniques, Neptune had his guards take the three princes to experience a course on Observation Haki. Alfia and Nanami also found an excuse to join in.

After everyone dispersed and the training ground quieted down again, Neptune took out a treasure chest and presented it to Tianxing with both hands.

"Lord Prometheus, this is what you mentioned earlier—"

"The Fish-Men's taboo: 'The Deadly Poison'."

He explained solemnly, "These pills can greatly enhance the user's strength in a short period of time, but the price is overdrawing one's life force."

"The more these pills are used, the more significant the effect, but the more severe the side effects."

After speaking, his eyes held a hint of barely concealed worry. "I wonder what your plans are for this, sir?"

"Don't worry." Tianxing took the treasure chest, opened it, and looked inside. "I won't let your people touch this. It's for monsters, used to enhance their training intensity."

"A monster?" Neptune was a little confused.

"Hmm... you wouldn't understand even if I explained it to you now." Tianxing waved his hand. "You'll understand later."

Seeing that he had no intention of saying more, Neptune did not press the matter further and smoothly moved on to the next issue.

"Information about Devil Fruits—"

"Shambodi will be holding a large auction soon, and perhaps you could go and take a look. However, if we merfolk were to accompany you, it might attract attention and cause you trouble. Please forgive us."

"In addition, regarding the clues about Sleeping Ancient Town that you mentioned, we have also found some leads in the ancient books in the Dragon Palace Library."

Tianxing took the intelligence report and looked at it carefully.

Before entering the world of One Piece, he had specifically observed the fates of Red Earl Redfield and Enel, confirming the exact locations and timing of their acquisition of Devil Fruits. After careful consideration, he decided to infiltrate at this particular juncture.

There are two main purposes for this trip.

Firstly, he needs a harmonious and united fish-man race to assist in the development of Melon Town. Therefore, Tiger and Otohime, the opinion leaders of the fish-man race, are the key targets for him to win over.

Secondly, it is to collect different types of Devil Fruits—ideally, one of each of the Paramecia, Zoan, and Logia types.

After bringing the Devil Fruit back, we can ask the great Lady Black Tower to study these specialties of the pirate world and see if we can remove the user's fear of seawater. If possible, it would be best to replicate them using our own World Tree.

Currently, the first objective is progressing smoothly. As for the second objective, we have information on the Bat-Bat Fruit for Zoan-type Devil Fruits and the Rumble-Rumble Fruit for Logia-type Devil Fruits. Next, we just need to find a way to obtain a Paramecia-type Devil Fruit.

Therefore, the Sabaody Archipelago seems to be an opportunity that cannot be missed.

Just then, a guard came running from a distance and knelt down on one knee in front of Neptune.

"Your Majesty, Miss Shirley requests an audience—" His voice was slightly hurried, "She says... there has been a new prophecy."

Neptune frowned. "What's the content?"

The guard's Adam's apple bobbed, and he lowered his voice before saying, "She said, about two years later—"

"Fishman Island will perish, and the Fishman race will vanish!"