One Piece: Umi no Heso no Daibouken-hen
ワンピース ルフィ落下!秘境・海のヘソの大冒険
Special 2000
Country: Japanese
Release: 2000-12-20
Status: Finished Airing
Episodes: 1
Genres: Action Adventure Comedy Fantasy Super Power
Official Sites: 暂无
The Straw Hats encounter a city in the middle of a whirlpool, called the Ocean's Navel, that is being destroyed by giant monsters. These monsters supposedly protect a treasure capable of granting wishes, but in the process of defeating these guardians, the crew ends up releasing another evil. (aired after Episode 53)

(Source: Wikipedia)

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