Yuuki Hamano

After trying to rescue a man on the subway tracks, two teens wake up in a room dominated by a mysterious black sphere that sends them to hunt down and kill aliens hiding on Earth.

In 19th-century London, class lines are sharply drawn, and the social standing to which people are born dictates the path their lives will follow. Emma, an honest and hardworking young maid, never felt her place in life to be a burden. But then she met William, a member of the gentry and the eldest son of a wealthy family. His warm smile and earnest affection threaten to capture her heart... but can love truly conquer all?

A group of sisters are the only ones who can pilot a mysterious robot to save the world from an unknown alien life-form.