Onigashima

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Starfy standing in front of the Dragon Palace Castle. Past the castle live the Oni

Onigashima (Japanese: おにがしま), literally "Island of Oni" is an island visited by Starfy in chapter 10 of the Densetsu no Starfy R manga, where he was raised up as "Hostarou" (Japanese: 星太郎). It is based on the island of the same name that Momotarō visited in Japanese folklore.

While trying to get to Onigashima, a 'rabbit' that looks like Starly wearing rabbit ears and two front teeth gave Hostarou a boat, but it split in two when Hostarou tried to use it.

Hostarou then had to jump off seven fish from larger to smaller sizes including a shark, a tuna fish, a swordfish, a suzuki, a sea bream, a Japanese horse mackerel and a clownfish. He then had to swim the rest of the distance to the island.

On the island is the Dragon Palace Castle. Past the door to the castle is where the Oni stay. Hostarou got hit on the head by an Oni there with a spiked club similar to a morning star. He was then chased away by multiple Oni.