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.