I Have a Sword to Protect the Peace of the Human Race for All Eternity

Dao of swords + spells + single female protagonist + alien invasion By chance, a baby transformed from golden nanmu fell into the human world. It lost its memory and demonic power and grew up in the human world. It coincided with the invasion of demons from outside the territory. This sword should cut down all obstacles in the world, and this technique should destroy all powerful enemies in the world.