Hibiki Mano

We've all seen hundreds of stories about the origins of both superheros and supervillains, but what about the origins of the supervillain's minions? At long last, the time has come to learn the secret story behind all those faceless, anonymous battle casualties! When a beautiful agent attempts to infiltrate the evil Dark Mist organization, she discovers just how hard (and frequently fatal) learning to be cannon fodder really is!

In this world, there exist demon swords. Those who have the sword will have their will taken over, and they will lust for human blood and keep on killing indiscriminately. The sealer is who searches for those blades that haunt people and seal them with his scabbard.