Ultraman Saiyan: Ultraman Zero's sister, Ultraman Kaya's parents both died during a mission, Ultraman Seven adopted the young Ultraman Kaya as his daughter and changed her name to Ultraman Saiyan.
Ultraman Saiyan's best friend (Ultraman North) fell into darkness. In order to bring her back to the land of light, he chased her all the way to the vicinity of the earth. Unexpectedly, he had a battle with her and was seriously injured. He fell to the earth. He met Ning Xue and gave her his power of light. Ultraman North also came to Earth and possessed Ning Xue's best friend Mona. The story of two Ultraman falling in love and killing each other begins.
Later, she discovered that she had the power to travel through time and space, and could travel freely in the universe, and even go back to the past and the future. After Ning Xue ended her mission on earth, she started a new adventure in other Ultraman worlds.
