Zuori Qing Kong Pilot  

昨日青空（动画样片）

In the 90s in China, Tu Xiaoyi, who was then a high school student, had no interest in grades and preferred spending time playing video games with his friend known as "Peanut." One day, he was selected by his teacher to serve as the class representative alongside Yao Zhetian, a popular girl. This marked the beginning of Tu Xiaoyi's first romantic experiences and disappointments.

Manhua artist Pocket Chocolate produced a sample pilot adaptation of his work Zuori Qing Kong (published outside China as Crystal Sky of Yesterday) in hopes of later creating a full-length animation film suitable for audiences born in the 1980s and 1990s. The pilot film was released in January 2014 after a half years work and elicited much feedback before he began work on a full-length film.