This work is set in modern Japan and describes a mysterious group of people who travel through the shadows of history - the Blade Sealers. The evil spirits in this world will seek out people's resentment, jealousy, and anger, and intertwine with them to form terrible filthy blades that kill people invisibly, and the victims will only turn into ashes that ordinary people cannot see and drift away. The Blade Sealers are the ones who have the ability to see the filth in this world and seal it, but the sacrifices behind this chivalrous act are far more ruthless than imagined...