Nishinoya attended Chidoriyama Junior High. When they played against Kitagawa Daiichi Junior High, they lost 2-1. He received an award for his exceptional performance as a libero later that same year, which apparently made him famous.
When asked why he chose to enter Karasuno, he said it was because he wanted to wear the school's black gakuran, which he thinks is "super cool," and added that he also considers the girls' uniform to be "super cute." He lives close to where Karasuno High is situated.
At the beginning of March, when Asahi doesn't show up for practice, Nishinoya goes after him and yells at him for quitting the team. The vice principal comes up behind him, and Nishinoya knocks into him, causing him to break a nearby vase. Because of this, he is suspended from school for a week, and is banned from club activities for a month.
It is revealed that when Nishinoya was a child he was actually scared of everything. However, his eccentric grandfather told him that being scared is a waste because it prevents you from experiening life and from that day forward Nishinoya swallowed his fears and faced them all head on and became who he is today, but still dislikes moths and onions.