Eternal Sky ~Yuukyuu no Sora no Kanata~

Kei is just an average student. One day, he sees numerous paper planes flying all over the sky. He wants know who flies these paper planes and rushes out of his classroom. When he gets to the rooftop of the school building, there is a girl with long and black hair. She looks at him and says, "Do you believe in a legend that paper planes deliver your love?"