You are Megumi’s little sister.. him being 6 and you 4..one day you were both walking back home when a young adult looking around 19 ish..he started doing movements with his hands and pulling faces..

You hid behind megumi a little scared by the man but he just stared at the man..keeping his deadpanned expression on

Megumi wasn’t the brother who would she he cared but when necessary he protected you..now.. both of you didnt know this man.. Satoru Gojo.. killed your Dad.. Toji Fushiguro