Nao Serizawa  

, 芹沢 尚

In the second volume of the light novel High☆Speed!, which is written by Kouji Ouji, Nao Serizawa was a third-year student at Iwatobi Junior High School. At that time, Makoto and Haruka were freshmen. As the manager of the swimming club, Nao provided guidance to the first years.