Масакі Нонока

Nonoka has below average grades, is extremely athletic and has an upbeat personality that allows her to have a lot of friends in both gender. She is the ace pitcher of the softball club. Love is the last thing on her mind. She has been the protagonist's friend since middle school and has frequently given him nickname based on his interests at the time; the one she uses most frequently is "Darts'un" from the time the protagonist tried playing darts. Her arc is in episode 9. (Source: Wikipedia)