Kana is the only daughter of Josephine Ambrose—world renowned doctor and researcher, and creator of A.E. Potentia. In a world where some people are infected with a parasitic disease that can leave the host with inhuman abilities or, most often, cause the host to die, A.E. Potentia has been invaluable in the survival rates.

After Josephine’s quiet disappearance and Kana’s near-fatal kidnapping attempt, she's back in her home country of Oshiya, and dragged into a dangerous bargain: help the president of Oshiya track down her mother, and officially break ties with Oshiya forever. Saddled with an unwanted bodyguard, who is irritatingly good at his job, she begins her search.

What begins as a reluctant mission twists into a perilous scavenger hunt through her own past. As Kana becomes the target of increasing attacks, dangerous secrets surrounding her mother and the drug begin to emerge.