kill to live

When one little mistake gets Aimi and her younger brother, Haruto, kidnapped, they're forced to fight for their lives by learning to be the best killer they can possibly be. They're in a contest to become a successor to one of the 13 members of the elite assassination squad, the Zodiacs. Against 8 other children, who will survive, and who will die?

The killing shouldn't be the problem for any of them, it's the surviving that should prove to be the most challenging, because they've all killed before, even the little five year old boy.