Castaway

A desolate shore swept by the unforgiving tide of the ocean. The salty sea breeze wafting the hair slowly nestling against the face of a young man stranded on the beach. The boy awakens to find strange creatures corralled around his collapsed figure. Standing and following the creatures reveals a bizarre hobbit of a man wearing naught but a bush and treasure chest as apparel.

"The name's Gaimon, are you a pirate as well?!"

Pirate? What's this strange man talking about? Where even am I?

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This is a crossover between COTE and One Piece. Ayanokouji washes ashore on Gaimon's island and they start their adventure there during the East blue saga.