The Nature Hashira

Within the 9 Hashiras, there is a hidden 10th, the Nature Hashira. She is a demon, unlike the other Hashiras. No one knew about the 10th, except for Ubayashikis. That had been the case since the Sengoku era. But in the Taisho era, the mask of her true identity and history starts to crack. What will happen to her and the future of the Corps once it gets revealed?