One Piece: Conquer the World Starts from Impel Down

Haiyuan calendar year 1499. The entire world continues to be in turmoil due to the Great Pirate Era that was ushered in by the execution of Pirate King Gol D. Roger last year. But no matter how turbulent the world is, it cannot affect the large underwater prison located in the windless zone in the first half of the Grand Line. It is known as the world's first prison with "iron walls" - Impel City "Imper". This tower-like prison was completely sunk in the windless zone in the first half of the Grand Line, and was surrounded by huge special creatures called "Neptunes". Except for the legendary "Flying Admiral" Golden Lion Shiji, no pirates could escape at all. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.