Other name: 盟約のリヴァイアサン, 盟约的利维坦, Meiyaku No Rivaiasan, The Leviathan of the Covenant
Summary: Two decades ago, the dragons returned to earth. Soaring above the skies leaving behind trails of destruction. They attack humans for the simple reason, their destructive impulses. In order to fight the dragons, humanity acted. They began to dabble in magic...