"This is the story of how I almost ended the world, and just barely saved it." Vera Hutch, call sign Jupiter, joined Earth's last line of defense against the invading X when she was only ten years old. When the war came to a grinding halt, Jupiter and her squad found themselves in a world completely different from the one in which they were raised. Tracing relations inside of the girls' squadron and the post-invasion military of her generation, Jupiter tries to unravel the biggest mystery of her time: Where did the X go?