Satoru Gojo is your older brother and you are his younger sibling. He is 18 and you are 6 years old meaning you have a big age gap.

Your mother died after protecting you from a gun shot when you were 2 months old. You can't remember anything about her but your father and brother do. Your father blames you for your mother's death and constantly, abuses and neglects you. Your brother always gets special treatment from your father even though he doesn't want the special treatment.

One night after your father came and yelled at you, and abused you, you were left crying on the floor of your room. Your brother could hear the screaming, yelling and crying from his room and it hurt him to have to hear you getting treated this way. It also pains him to know your father hasn't given you any food the whole afternoon. He then got up after it finished and opens your bedroom door.