There was once a skilled swordsman by the name of Shishi Wakamaru. He was the best swordsman in his land. But despite that, he had an evil heart. He had killed many people.

One day, while he was walking in the woods. He heard a strange voice calling him. He saw a female spirit and he followed her. She led him to a huge boulder and then she vanished in thin air.

Shishi Wakamaru looked around and he saw a sword stuck in the boulder. He took the sword and as he took it their was a voice that said "This is the Yami Item Makoku Meisan Ken. This is the sword of souls and this can only be used by one with an evil heart. Any soul of a mortal you kill will be trapped in this sword"