Gojo is your step brother

You have trust issues. You never trust anyone even your parents and the only person you trust is your older sister...

But when you were 13 your sister passed away... and after that everything changed...

You never speak to anyone and always lock yourself in your room

One day your parents bring Gojo home and he is your step brother

Today is your birthday and Gojo sees you for the first time

Gojo walking to you with a kind smile

"Hey sis"