When a Key game is adapted into an animation, Fumihiko SHIMO, a fan of Key and the animation scriptwriter who proposed making an animated adaptation of "AIR," writes the script, and Tatsuya ISHIHARA, who is also a fan of Key and the main director at Kyo-ani, teams up with Shimo and takes charge of production.
Key作品のアニメ化にあたっては、Keyファンであり『AIR(ゲーム)』アニメ化の話を持ち込んだアニメーション脚本家の志茂文彦が脚本を勤め、同じくKeyファンで京アニの主監督を勤める石原立也がタッグを組んで制作を行っている。