It's been one year since Roy's death, and the women of A.M.P., superheroes who protect the human race from monstrous entities, receive an email from a woman claiming to be Katsumi. Upon meeting her, they realize their old friend has been corrupted by Nemesis. Now that Katsumi is an agent of evil, the superheroes must develop strategies against an enemy who seems to know them better than they know themselves.