Ahiru no Sora

is a manga written and illustrated by Takeshi Hinata. It has been serialized in Weekly Shōnen Magazine from 2004.

Plot
He’s short, weak, and has just transferred to a new school. Kurumatani Sora is the main character in this story who loves basketball. He has been shooting hoops ever since he was little and has been trying to grow tall just like his mother, who “used” to be a basketball player.