In a world where monsters, dragons, and even gods exist. Humanity's weapons in this world were far too meager to face them. But— "I-Is this really the Spear of Longinus that can kill even gods...?" "The holy sword Balmung... Can this mere blade truly cut through dragons?" "The Sain Sword that splits even waves when used at sea... Impressive!" Those things? In Earth's mythology, you'd barely be called a hero for wielding such weapons.