Elfen Laid (2005)

It is around the fifth century in Europe. Teodora and Helena were daughters of the royal family of Burgund. Burgund had been known as a brave country, but they were defeated by Melven, and Teodora and Helena were captured by them. Melven soldiers raped the captured Burgund women. Because Theodora didn't want to be raped, she tried to commit suicide. However, when she heard that Helena was also captured, she made up her mind to devote herself to them in order to help her sister.