Centuries after an ancient pact between the Miroku clan and underworld forces sparked conflict among rival ninja groups, a long period of calm comes to an end. With a new leader rising in the demon realm, young trainee Midou Miko inherits her family's duty to keep these beings from crossing into the human world. Relying on her skills in combat and arcane techniques, she faces her first challenge in containing the emerging threat. Through quick thinking and disciplined resolve, Miko works to uphold the fragile peace and safeguard those around her.