Zuori Qing Kong Pilot
English title: Crystal Sky of Yesterday
Japanese title: 昨日青空（动画样片）
Alternative titles: Zuo Ri Qing Kong Pilot
Type: ONA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Jan 21, 2014
Duration: 4 min
Rating: PG-13 - Teens 13 or older
Studios: Seven Stone Entertainment
Genres: Drama, Romance
Themes: School

In the late 90's, in China, Tu Xiaoyi, an high school student, takes no interest in marks and prefers to play video games with his friend nicknamed "Peanut." One day, he was chosen by his teacher to become the class representative with Yao Zhetian, a very cute girl. He will experience his first love 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 year's work and elicited much feedback before he began work on a full-length film.