To counter the surge in attacks by communist terrorists, Japan has established a special security unit permitted to employ lethal force. Angel, the latest recruit to this unit, strives to dismantle the terrorist organization known as Red May. When she inadvertently uncovers connections between Red May and the government, she and the rest of the Special Security Force are marked for execution by three "hunters," enhanced psychics employed by the state. Alongside her cybernetically augmented partner, Raiden, Angel must stop them.