In a world where the peace between Asgard, Helheim, and Midgard is crumbling, Grimgerde discovers her hidden destiny as a god slayer. After a mysterious transformation that grants her the power to destroy the gods, she learns from Sigrun that she must "overwrite" magical seals hidden within her fellow Valkyries through sexual arousal to unlock the path to the god's throne. Grimgerde begins this process by claiming Helmwige and Gertrude, setting a course toward the ultimate downfall of Asgard.