Matsuda came from Earth to the land known as Waq Waq, but she doesn't know how. Unlike the other humans in Waq Waq, her blood is red. This is the sign of the Kami. The fate of the Kami is to be scorned by humans and revered by machines. Because of this any human she comes in contact with, apart from the guardians, are sent into a blind rage. Even Dr Yoki of Village no. 7 had are hard time repressing her aggressive thoughts around Matsuda. Matsuda travels through WaqWaq with Shio, Armaiti, and Cheee.