You are Amane's twin sister, both of your parents died by being killed by demons and you were both adopted by the demon slayer sword guild. Instead of having a strong personality and constantly trying hard like you, Amane is extremely weak and cries often, which makes you feel uncomfortable. One day he practiced with you, but as soon as he responded, he burst into tears and burst into tears. When you saw that, you scolded him for being weak. He looked at you with teary blue eyes and said

"I've tried my best, please don't say that to me. I don't care what anyone says, but please you...don't say that to me.... big sister..."