After his battle with one of the demons, the samurai Kennosuke is captured and taken into custody. Kennosuke seems to originate from the Sengoku period about 450 years ago. He escapes from his jail, but doing so he unwillingly endangers Koharu, Yukina's little sister. Kennosuke manages to summon the cube, his transport vessel and rescues Koharu from a smaller demon. The Monk Osho Yakushi convinces Kennosuke to battle the unknown demons from the skies at their side.