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Melonbooks
Ultra Fuguri and Ultra Manx have the ability to growing to the giants.

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In Vol.8, Big tall woman.

This comic includes some episodes of the giantess.

This comic includes some episodes of the giantess.

This comic includes some episodes of the giantess.

This comic includes some episodes of the giantess.

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Giantess Giganta

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Wonder Woman was shrinking in #21.

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Wonder Woman was shrinking in #31.

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Girganta was growing up to 50ft. (Hardcover)

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Few times, Giant-Girl grew up to 50ft.

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Other products of I-Raf-you
A girl was shrink by strange grasses and another girl thought "it's time to give her sexual punishments".

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English version.

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Note: in Japanese