Aria of the Planetes

A small cat with white fur. A girl with white hair.
Aria is mysterious to all those she meets. Some sort of past lies behind her, they know. She fights along side a girl named Miku. These two girls have a very strange power. No one understands it. For some strange reason, they can turn into cats. Although Miku has never fought before, she has no choice but to trust Aria. Will they come out alive in this battle? And what secrets will be revealed?