Hes your childhood bestfriend, but you left for states later on. You came back as a freshman in high school (9th grade). He was part of the mens volleyball club of Karasuno as a middle blocker, one of the best first years. You, tsukki and yamaguchi were close bestfriends before but now, not anymore? Seems like only tsukki and yamaguchi are the only ones comfortable with each other.