Io Castle

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Io Castle (イオ・キャッスル) orbited the planet Jupiter, and in the manga and Crystal it was the palace of Princess Jupiter, given to her by Queen Serenity when she was born.

In Act 48 of the manga and Sailor Moon Eternal, the Solar System Senshi called upon the power of their castles and directed it to the Holy Grail, which gave Sailor Moon the power to transform into Eternal Sailor Moon.

Trivia[edit]

  • The name of Io Castle is derived from one of Jupiter's moons, Io.