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- Giant Warrior Nagi: A "Battle Gem" is crafted to have women be enlarged and fight each other. These women can easily surpass 30 meters (bigger or equal to a standard giantess).
- Gigant: Created by Oku Hiroya (the same who creates Gantz). A device implanted on Chiho makes her able to become giant in size. WARNING: This manga has very explicit scenes, if you're going to venture to read it, do it at your own risk.