Aozora Floppy

(from ebookjapan):

Twelve years ago, Tokio Sorano was picked up in a coin locker at Shinjuku Station and raised by a group of vagrants. Undeterred by adversity, Tokio grew up to become a popular boy in the city.

His homeroom teacher, Masao Marui, who has a burning sense of duty as a teacher, tries to understand him, but Tokio is out of the norm in every way. As soon as he entered the school, Tokio happened to show off his brilliant soccer skills. His feet caught the attention of his classmate Takano Miyako, a forward on the boys' soccer team!

(Desc. of Volume 1!)