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Luffy singing the first verse.
Luffy's Skypeia Song was a brief song, apparently of Monkey D. Luffy's own invention, meant to accompany exploration in Skypeia. Its two verses were first sung in Chapter 257 (Episode 169); Luffy had apparently prepared more verses, but was interrupted by Wyper before he could sing them.
In the manga, to reflect Luffy's childish nature, the lyrics are depicted solely in hiragana, even for words One Piece usually spells with the more sophisticated kanji system.