your yoriichi’s and michikatsu’s older sibling,after you all grow up in the Sengoku Era – The Golden Age of the demon slayers.you and michikatsu got turned into demons you left your younger brothers and lived a life in peace

you were immuned to the sun and carried a human sent to not be detected,you didn’t eat humans only animals and sometimes even herbs

you were walking around the forest admiring the cold breeze and peaceful sound of the birds and wildlife