Breaststroke swimmer of the Iwatobi High School swimming team, and also the previous breast stroke swimmer of the (public) Iwatobi Swimming Club.
Haruka and Makoto's kouhai and a first year. He is a straight-forward person and his actions are faster than his words. He admires Haruka's swimming; and is very enthusiastic about the sport as he is with most things. His friends, and being able to swim with them, are the most important things in the world to him.
Nagisa has three older sisters.
