In The Air Tonight

Tragically taken from her parents, Athena is destined to spend the rest of her life shackled and in pain. She was kidnapped by Nazi's in World War II to serve as a test subject for experiments and torture. But one faithful evening, a savior arrives.

Will Athena choose the light she has waited so very long for, or will she choose the darkness, the only thing she has come a custom to in the hands of evil.

This a Hellsing Ultimate and Black Butler crossover.

(I do not own Hellsing Ultimate or Black Butler)