a young man transmigrated to the One Piece World, no cheats, no system, and no harem. Sigh...
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this is Au, so don't be a baby when you see a lot of changes in the story. LOLOLOL
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English is not my first language.
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[I don't own One Piece, credits belong to the respective creators. the cover pic is also not mine]
and also you can read it at royalroad.com