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Hiyoko is Peasuke Soramame's much taller girlfriend who is two grades below him.
Hiyoko is very tall for her age, has long black hair and wears a dress. Ironically, Peasuke is very short for his age.
Hiyoko was shrunken down really small after being hit by Senbei's Big-Small Ray Gun when Arale tried to make her small for Peasuke. However, she makes her too small. When she is just about to be attacked by a bug, Peasuke saves her with his Peasuke Kick.
She is seen with Peasuke among thePenguin Village residents who run after Arale and Gatchan in the chapter "Penguin Village Dom-Dom-Dom!"
Hiyoko marries Peasuke sometime in the future and they have a son named Poosuke Soramame.
- Her name translates to Chick, being a pun on a bird as well as a slang term for a girl.