This show centers on three women and their connections to one-another and an upcoming anti-terrorism summit in ShangHai, China. One of them is Canaan, a Middle Eastern assassin and mercenary. Another Another is Alphard, Canaan's rival and also a skilled assassin and mercenary who heads a terrorist orginization called Snake. The final girl Maria Õsawa, a victim of an attempted biological terrorist attack in the streets of Shibuya two years previous. Their encounters lead armed interventions between Alphard and Canaan with a deep and tragic history common.