The student Oomori Taiki has a special ability where he can tell a person's killing intent by looking at them. Taiki, has had to live with perceiving people's filthiness from a young age. At one point, when he easily dodges the blade of someone stalking his female friend, a young girl that saw it asks him to become the Master of a "Katana"...?! Our expectiations in this new star are set free and the Heisei era demon blade sealing martial arts story of the "sheath", Sakura, made to seal demon blades, and her master Taiki begins here...!!!