Gods in heaven, demons on earth, and a giant floating continent inhabited by humans. The continent known as the『Floating Continent of Yggdrasil』is also considered a floating miniature garden of the gods. It is a place where the human survivors of the great war live, the continent closest to the realm of the gods. The Demon Emperor Surtr who has his eyes set on that continent said this to his heirs: “The one who brings me the Heart of Yggdrasil said to be safeguarded by the goddesses on the Floating Continent of Yggdrasil shall be the heir to my throne. As long as you get your hands on the Heart of Yggdrasil, I will not question your methods or your past transgressions. You are free to make alliances between yourselves, sabotage, or even ‘remove’ your fellow heirs as you would any obstacle. Kill and rampage as you wish, and prove to me your strength and worth!” Hearing those words, Surtr’s heirs, all having motivations of their own, began their invasion of the Floating Continent of Yggdrasil. Among them, an ostracized member of the demon nobility, Loki, has also decided to participate in the prolonged battle for the throne.