Mai Ball!

Mai has been helping out her childhood friend, Kunimitsu, every morning with soccer practice ever since they were little. After years of practice, Kunimitsu has been MVP 2 years in a row at the middle school nationals. One day, Reika - one of Kunimitsu's admirers - witnesses the two childhood friends practicing, and is shocked by Mai's ability to keep up. Determined to prove herself to Kunimitsu, Reika challenges Mai to a soccer challenge. Caught between her childhood crush and new competition, will Mai be able to hold her composure? With a tendency to get too nervous or fantasize about Kunimitsu, Mai has a hard time playing soccer outside of practice. Can she stop her lewd fantasies long enough to beat Reika?

(Source: MangaHelpers)