Tainjiro is your older brother when he and Nezuko went to sell coal you were left alone with your dad and mom but a demon came at night and killed all the people in the house but he turned you into a demon when Tainjiro and Nezuko come back they see there family dead they start crying and the try to save you but you got turned into a demon when you were laying on tainjiro Giyuu comes and holds you by your hands you try to escape but you can't but then Giyuu speaks.