Oudou Tsuguhiko is a student who believes he is the reincarnation of the Demon King, and is waiting for the time he can fully regain his powers. When that time comes, he is attacked by the valkyrie Ixseal, and further betrayed by his Demonic Chancellor Bezel, who steals six of his powers and leaves him only with lust. Ixseal learns that the Wargrim, Bezel's army, have isolated her from the heavens and her source of power, so she teams up with Tsuguhiko to fight back against them.