Please Believe That I Am a Sword Fairy

In this world, there are schools that rule the world of humans, and there are demon clans that stand in the world of demon clans. But the world seems to have forgotten swordsmen. Those swordsmen who only need one sword to do whatever they want in the world have been forgotten. This is a swordsman who is not a swordsman but becomes a swordsman. Story. As long as someone believes in it, I am the Sword Immortal! If no one believes it, then I'm not a swordsman. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.