The Man Imprisoned on the Seventh Floor by One Piece

Impel Down is the first prison in One Piece. The world only knows that Impel Down has six floors. In fact, Impel Down has seven floors. There is only one prisoner among them, and he is a vicious person who almost overthrew the World Government. On the day Luffy escaped from prison, a person from the real world was accidentally reincarnated into the criminal's body. . . . . This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.