UWASA NO MIDORI-KUN [Manga]

From Tenshi-Tachi: Yamate Midori is a 15 year-old girl and is very much a tomboy. One day Midori meets a boy called Hino Tsukasa, who came to the island she lives on for a holiday. He teaches her to play soccer and she falls in love with the sport. Midori is inspired by Tsukasa and continues to play soccer in hopes that they would meet again someday. When they do meet again Tsukasa loses her trust by doing something unforgivable. Determined to defeat Tsukasa on the soccer field Midori enrolls in an all boy high school.