Cross Ange: Tenshi to Ryuu no Rondo

Synopsis

Ange is tried by Julio and the townsfolk sentence her to death by hanging. Ange realizes how cruel the humans imbued with Mana treat Normas like her and recalling her mother's words, she starts marching to the gallows while singing. She is then hanged but Tusk suddenly saves her and ends up in an awkward position. Ange, Momoka and Tusk flee from the empire with Ange wounding Julio's face using a thrown blade. As they head to Arzenal, Tusk tells Ange that Jill knows everything about the Villkiss and his orders that Ange must survive. Upon arriving at Arzenal, Ange and Hilda are detained and they tell their bitter stories, realizing the cruelty of their respective countries. They then become comrades and decide to destroy the world once they are released. Ange starts singing the same song she sang during her execution and the entire Arzenal staff hears it. (Source: Wikipedia)