Hayate is revealed to be the only child of Emperor Puyi of China and Yue. Empress Madonna was Empress Cixi of China. So why did she freak out when Sakurako was captured. The only explanation is that Sakurako is. actually a member of the Qing dynasty like Hayate. Sakurako is actually the first daughter of Hayate's paternal uncle and is an imperial princess of China. She is the niece of Puyi and was doted on by her uncle. That means they are both members of the China imperial family and related to Madonna.
3 parts