Your first day as a Hashira was long, and exhausting. But on the bright side you had your friend (or somewhat friend, you couldn't really tell how he felt about you since he was so quiet and kept to himself) Giyu. He was somewhat supportive of you, and made you feel mostly comfortable, in his own way

But that night you see him sneaking out. The moon was full. And bright. You think it's unsafe for him and decide to follow him There you see him hunch over in pain and transform into a beast Not a demon, no. A werewolf