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One Piece: Sign in at the beginning of the game

Roja found himself transported to the world of One Piece, starting out within Doflamingo's Birdcage. Fortunately, he activated the Sign-In System and obtained the legendary heat-type Zanpakutō—Ryūken Wakahara! "Everything in the forest turns to ash, and the blade burns like fire." This blade is renowned across the seas for its terrifying flames! The Five Elders: "Damn it, who is this person who keeps hindering us?" Sengoku: "This guy must have some hidden agenda!" Akainu: "His flames... they can actually hurt me!" Red-Haired Shanks: "This person is definitely someone worth watching!" As Roja continues to sign in across various islands, he gains even more god-tier rewards. From this moment on, he is the strongest on the seas! ---- •Disclaimer: English is not my native language; I am trying to improve as I write. •Also, the cover image is not mine. I got it from Google. If the creator sees this and wants credit or wants me to take it down, just let me know. •I don't own One Piece or any other characters other than the Oc's. This is purely a fanfiction. *"*"*"*"*"* This is a Translation Alternative names:海贼:开局签到流刃若火 Author: Ni_Bi_Cheng_Feng

Nyxal · アニメ·コミックス
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50 Chs

Mission dispatched, Akainu attacks

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Marineford, Inside the Office of Fleet Admiral Sengoku

Sengoku stood by the window, gazing at the courtyard below where Kalifa and Hina were engaged in a fierce sparring match. He let out a weary sigh.

No one understood Roja's strength better than Sengoku. Roja's mastery of Armament Haki had reached its pinnacle—a level very few in the world could claim to rival.

In his mind, the possibility of someone defeating Roja was almost unthinkable. If Roja hadn't returned, it wasn't because he was defeated but likely because he was delayed by something beyond his control.

Sengoku sighed again and turned to his desk, picking up a mission plan. This operation had originally been assigned to Roja due to his unmatched strength, ensuring the highest probability of success.

However, with Roja absent, Sengoku had no choice but to reassign the mission. Akainu would have to step in.

Kizaru, currently on duty, couldn't leave Marineford unless it was for a critical situation. Aokiji was already tied up with other assignments, making Akainu the most viable candidate.

Moments later, Akainu entered Sengoku's office, his expression stoic as always.

"Fleet Admiral!" Akainu saluted crisply, awaiting his orders.

"Akainu," Sengoku began, his tone stern, "according to intelligence reports, O'Hara hasn't shown any significant changes except for the addition of a defensive perimeter formed by the roots of the Tree of Knowledge. The mysterious powerhouse we encountered previously hasn't reappeared, suggesting their defenses might be weaker than anticipated.

Your mission is to investigate and test their defenses. If you confirm that they lack sufficient combat power, destroy the island and all its occupants. However, if you encounter resistance that exceeds expectations, request reinforcements immediately. We will mobilize additional support as needed."

Akainu's fists clenched tightly, his veins bulging with suppressed rage.

The debacle at O'Hara remained a black mark on his record—a humiliation he could neither forgive nor forget. Since that day, Akainu had pushed himself to the limit, tripling his training regimen and further refining his abilities.

Now stronger than ever, he was determined to avenge his disgrace.

"Understood, Fleet Admiral! Justice will prevail!" Akainu replied, his voice firm and unyielding.

With those words, he turned and left the office, his resolve unshakable. This time, he vowed, O'Hara would be obliterated completely, removed forever from the map of the world.

Two Days Later, Near O'Hara

Sitting on the edge of Noah's Ark, Roja finally saw the unmistakable sight of the Tree of Knowledge reaching skyward from the island below.

A faint smile spread across his face as he thought of Robin. He wondered if she had been missing him as much as he had missed her.

However, he knew time was of the essence. There was no room for delay. He guided Noah's Ark to begin its descent, intending to check on Robin before returning to Marineford.

O'Hara

Robin was practicing her Devil Fruit abilities on the coastline when she froze, her eyes widening in alarm.

"Mom, there's a powerful presence approaching!" Robin exclaimed.

Olvia followed her daughter's gaze, her pupils shrinking as she recognized the colossal vessel descending from the sky.

"Noah's Ark!" she gasped. "How is this possible? According to ancient records, Noah's Ark should be near Fish-Man Island. For it to appear here, falling from the sky no less… How much power would it take to achieve this?"

"Robin, we must warn the scholars! We need to evacuate immediately!" Olvia said urgently.

Robin, however, didn't budge, her focus locked on the descending ship. "Mom, it's too late!"

The enormous figure of Edward Weevil, like a human mountain, leapt from the Ark and landed with a thunderous crash, creating a crater in the ground. The impact caused the earth to quake violently.

Both Robin and Olvia stood frozen, cold sweat beading on their foreheads.

But before panic could set in, a familiar voice echoed through the air.

"Robin, long time no see."

Robin's face lit up as she recognized the voice. "Brother Roja!"

The massive form of Noah's Ark vanished as Roja stored it in his spatial system, descending gracefully from the sky.

Without a moment's hesitation, Robin rushed into Roja's arms, clutching him tightly.

"Brother Roja, it's really you! You're finally here! I missed you so much!" Robin exclaimed, burying her face in his chest.

Roja smiled warmly, holding her close. "I missed you too, Robin."

Olvia, standing nearby, watched the reunion with a mix of relief and astonishment. Her gaze then shifted to the towering figure of Weevil behind Roja.

"Roja… who is this?" she asked cautiously.

Roja turned to her and replied, "This is Weevil. He's your new guardian."

Olvia's eyebrows shot up in surprise. "Guardian? What do you mean?"

"He's as powerful as Whitebeard was in his prime," Roja explained casually.

Olvia's jaw dropped, and she stammered, "The strength of Whitebeard in his prime? That's… That's unbelievable!"

Roja nodded. "He'll listen to your every order. You can rely on him to keep this place safe, no matter what."

Just as Olvia was processing this, the distant sound of cannon fire broke the calm.

One warship after another appeared on the horizon, rapidly advancing toward O'Hara.

Roja's expression hardened as he prepared for the inevitable confrontation. "It seems we have guests."

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