Sign-In System: One Piece, Demon Slayer & Beyond
Ron finds himself reborn in the world of One Piece, stranded on a remote island in the East Blue. But he's not just any ordinary child—he’s bonded to a mysterious sign-in system that grants him powers with every new location he visits.
At his first sign-in, he unlocks the legendary Sun Breathing Technique, along with a boost to his vitality. From Shitmotsuki Village to Skypiea, Enies Lobby to Marineford, Ron travels the world, collecting extraordinary rewards that make him a force to be reckoned with. The Raikiri, one of the 21 Great Grade Swords, Armament Haki, Observation Haki, and more fall into his hands.
As Ron steps onto the battlefield of Marineford during the legendary Summit War, the mightiest warriors—Four Emperors and Marine Admirals alike—pause, stunned by his presence. But Ron merely waves them off, "Don’t mind me. I’m just passing through."
Join Ron on his journey across the Grand Line as he signs in at iconic locations, growing stronger with every step. This is not just an adventure—it’s a legend in the making.
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This is a multiverse fanfiction starting in One Piece, transitioning into Demon Slayer, then to One Punch Man, and more.
If you’re only here for One Piece, feel free to stop when that arc concludes.
If you love crossovers, you can continue reading :)
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Access 40+ chapters in advance on my Patreon: pat reon.com /ElvenKing20.
So far this story is entertaining and balanced. The MC is still quite young and even though he has a cheating system that most stories would use to rocket the MC to the peak this story seems to recognize the importance of character development and actually allows the protagonist to experience the world more before jumping into the more chaotic waters. Knowing the plot and making subtle changes here and there the protagonist makes his mark on the world without completely subverting the plot… which is something that seems appropriate for the time being but I hope the future will see many changes culminating into a new experience while possible eliminating some of the undesirable elements of the original series. I can’t say much more as the story is only beginning but the plot is enjoyable, the writing is skillful, the characters are reasonable, the power given to the MC isn’t too far fetched in the world of Onepiece, the current company he keeps doesn’t effect the canon, and I have high hopes for a grand adventure as the story unfolds.
Well, it started off really well, but it kind of lost its charm when he started teaching “Kuina” the Breathing that was the secret to his strength, basically he gave her his power just because he could, without any reason. It's like you're handing out a weapon to someone who could use it against you at any time, that attitude was pure idiocy...
There wasn't much I could complain about until the the moment where Doflamingo attacks a ship Zephyr where the only competent one is MC for some weird reason and everyone else is mostly decorations for his glorious show of powers. I really don't like when authors add drama for the sake of drama or dumb down characters just to make MC look better.
Quite an interesting story , consider me fully intrigued and left wanting for more. I hope you release chapters regularly. Voted powerstoness!!
Raw ? .
................................................................................................................................................ Read the novel guys!!!
Good so far, can't wait for more chaps. ............................................................ ............................................................ ............................................................ ............................................................ Have a great day!
for you🍪🍪🍪🍪🍪[img=recommend][img=recommend][img=recommend][img=recommend][img=recommend][img=recommend][img=recommend][img=recommend][img=recommend]
The story is upto a great start. Other than the MC teaching Kuina his abilities things are progressing great. Hopefully you continue writing the story.
NGL this is ten times better than the other novel with the sign in system. This novel has a lot more substance in comparison.
This is a certified BANGER!!! Love the plot, the check in system thing is done well and the power progression (compared to similar type of ffs) is smooth. The characters are depicted well and I can’t wait for more chapters!!
great , totally great !! i love the mc n his power , keep it up man ..................,.,......................................................
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name of this raw fanfic....................................................................................................................................................
genuine five stars. This fic is really good. I have no more to say. to lazy to type more of my thoughts