In a time long before Rikuo Nura's birth, the renowned youkai Nurarihyon, leader of the 'Night Parade of One Hundred Demons,' fell in love with a human woman, their happiness overshadowed by the fox-demon Hagoromo Gitsune's menacing presence. Fast forward to the present, Rikuo has embraced his role as the Nura Clan's heir, balancing his human and youkai sides while concealing the youkai world from the Keikain onmyouji clan and his youkai enthusiast friend, Kiyotsugu. Determined to safeguard his loved ones, Rikuo faces his greatest challenge when Hagoromo Gitsune resurfaces with a deep grudge against his family, sparking a profound conflict that thrusts Rikuo into the heart of a looming war for survival.