In the bustling streets of Kyoto, two unlikely heroes are brought together by fate to combat the sinister forces that lurk in the shadows. Sei Hoichiro, a descendant of esteemed ninja lineage, longs for a peaceful life and resists the pressure from his grandfather to follow in his footsteps. However, his tranquility is shattered when he crosses paths with Kagura Kyouka, a descendant of onmyoji, who brings a new purpose to his life.