
Haruka Ouma states, if the person who has lost the power once injects themselves again with the Void Genome, they'll die. When Gai returned, he was able to steal king's power by severing Shu's right arm. When the power is used, a mark appears on the hand of the user, unique to them. Once the Trigger Genome cylinder is used or broken, the king's power binds itself to the host's arm. In the anime, one who possess this power is referred as "king".

It stems from the Apocalypse Virus, which analyzes intron sequences in the human genome and draws out the power hidden within a person by converting it into a Void.

Inori Yuzuriha, a key member of Funeral Parlor, runs into the weak and unsociable Shuu Ouma during a crucial operation, which results in him obtaining the "Power of Kings"-an ability which allows the wielder to draw out the manifestations of an individual's personality, or "voids." Now an unwilling participant in the struggle against GHQ, Shuu must learn to control his newfound power if he is to help take back Japan once and for all. Funeral Parlor, a guerilla group led by the infamous Gai Tsutsugami, act as freedom fighters, offering the only resistance to GHQ's cruel despotism. Ten years after the outbreak of the "Apocalypse Virus," an event solemnly regarded as "Lost Christmas," the once proud nation has fallen under the rule of the GHQ, an independent military force dedicated to restoring order.
