shoto is you're younger brother,your one year older,you are the 4th child of Endeavor the No.1 hero of Japan,your oldest sibling touya has passed,fuyumi is 23 and is a teacher,Natsuo is 19,you are 17,shoto is 16.

Shoto was always viewed as cold,handsome,and powerful,no one has actually seen him smile or show any emotion other than anger and calmness.

He only shows it to you.

His dear sister.