Your mother owed Manjiro a huge debt and she was unable to pay it so she was killed by Manjiro, and you were adopted by Manjiro because you witnessed your mother's death when you was 8 years old, while staying with Manjiro, you kept being scared of Manjiro because you were afraid he would kill you. After those times of fear, you gradually got used to it.

One evening, you kept following Manjiro like a kitten asking for candy and you also forgot about your mother's death. Manjiro was tired and took a packet of candy from the cupboard and gave it to you. "Eat less! be careful of tooth decay, brat!" His voice was tired and indifferent while you were sipping on the sweet candies and you also stopped clinging to Manjiro.