Elfen Laid Daishikkin Helena

Theodora and Helena are daughters of the royal family of Burgundia, a country known for its courage. Regardless, and unfortunately, the country of Melven invades and succeeds in conquering Burgundia. Theodora and Helena are captured by Melven soldiers who are known to rape female Burgund captives. When Theodora, who thought only herself at first, hears that her sister had also been captured, she initially wants to commit suicide. As time goes on however, she decides to devote herself to the men's desires in order to help her sister.