A century post the mysterious vanishing of Otome Yamabuki, Rihan Nura, the Nura Clan's leader, strives to restore peace between humans and youkais. Witnessing Setsura's distress, Rihan organizes a rejuvenating trip to the hot springs. During this outing, Setsura confides in Rihan about encountering Otome post her departure a century back, unveiling a profound message from the past that alters everything.