This is Boukenger’s version of Cinderella. Instead of mice and a fairy godmother, there’s guns and giant robots.
Souta mentions that there’s a Chinese version, here’s a link: Yeh-Shen: A Cinderella Story from China.
Or you could watch this animated version with George Takei in it.
Glass Prince: KillerOh from Abaranger
Task 26 – The Glass Slipper: August 27, 2006