I Opened an Evolution Chamber in One Piece, and Even the Four Emperors Want Memberships

Lin En arrives in the world of the Pirate King with a "Gene Evolution Pod" and opens a rundown shop in Mock Town. Here, he can restore an ancient bloodline in fishmen and fix the flaws of Devil Fruits, but his prices are outrageously demanding: either the blueprints for an Ancient Weapon or ten years of a powerful person's lifespan.

From then on, the order of the seas is turned upside down. To heal his arm, Red-Haired Shanks must trade a secret; to break through his bottleneck, Hawkeye is willing to wager his black blade, Yoru; Kaido can't get the death he wants and is instead offered an "Indestructible Body" package. When the Marines' Buster Call is wiped out right outside the shop, and the Five Elders arrive in person only to be turned away by a sign that reads "No Celestial Dragons or dogs allowed," everyone finally understands that the owner of this little rundown shop is the true "supreme being" of these seas.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.