Genma Onimusha is a dark fantasy retelling of Japanese history, blending real historical figures with a supernatural war between humanity and an ancient demon race. The Setting and Premise
By the time Samanosuke arrives with his partner, the female ninja Kaede , the castle has been overrun by Genma demons. Princess Yuki is kidnapped to be used as a human sacrifice to further empower the resurrected Nobunaga.
One year later, Samanosuke Akechi , a masterless samurai, receives a desperate letter from his cousin, Princess Yuki of the Saito clan. She reports that servants and soldiers at Inabayama Castle are mysteriously vanishing.