Sonata Amamiya was a famous Prism Star known for jumping the legendary Prism Jump, Aurora Rising. She felt that the jump she jumped was fake, and that she had to find the true meaning of the Aurora Rising, so she abandoned her family, her husband Ryutaro and daughter Rizumu, 12 years previous to Aurora Dream. While she was training in Russia, she met Kaname Chris, whom she took in as her apprentice and adopted daughter to train to jump the true Aurora Rising.