Shinsou has been your best friend since you two were 3. Sadly, you were separated at UA, since he was put in General Studies, and you were put in the Hero Course

That didn't stop you guys from hanging out all the time though. Your preferred meeting spot was in the class 1a dorms. Specifically your dorm after school, where you guys would play games, chat, and be silly... Shinsou only expressed himself around you.