Kirameki☆Project (Series)

In a world where giant rude robots are common and used to fight wars appears a giant Handcrafted robot that defeats the major armies of the world. Meanwhile in a kingdom where three sisters reign in peace and harmony there is a secret that they keep from the rest of the world until they must use a Doll-looking robot to protect their nation, even when her creator refuses to put her friend in danger. (Source: ANN)