long ago, the queen of demons Muzan gave a small snake an overwhelming amount of her blood. eventually that snake grew into a terrifying demon with the power to defeat even the legendary Sun Hashira Yoriichi. however, the demon never met the Sun Hashira, as he was deemed so powerful that even other demons feared him, eventually, two demons created a plan, one demon would create an extremely deep hole using his blood Demon Art, while the other used his blood demon art to create a sword that would put Orochi to sleep and keep him asleep as long as it was stabbed into him. however, now that Orochi is free he has begotten terrorizing a village and demands only one thing.... Beautiful Maidens!