Kaguya (Radiant Night) is of the Moon Tribe and is the adopted granddaughter of Mr. Bamboo who found her as a baby amongst the bamboo of Sasa Sanctuary. She is soft spoken, kind, and doubtful of herself. Kaguya cares deeply for her grandfather and would travel Nippon selling his bamboo wares.
While seeing the Emperor in Sei-an City he had her imprisoned without reason. After being freed Kaguya starts receiving visions of a dark room and feels drawn to Sasa Sanctuary. Once there she unearths a metallic bamboo stalk (rocket) below the crest of the Moon Tribe which was etched into the ground. Mr. Bamboo admits he knew it was hidden there and that it is the same metallic bamboo stalk in which he found her as a baby. He pleads for Kaguya to stay but she explains that she needs to find what it is that draws her to the moon and where she came from.